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This all is under GPL.
(See GPL reference, our clarification and commitment at the end of this text)
By Mario Danic <mario.danic@gmail.com> and Thomas Schmitt <scdbackup@gmx.net>
Copyright (C) 2006-2023 Mario Danic, Thomas Schmitt
Still containing parts of Libburn. By Derek Foreman <derek@signalmarketing.com>
and Ben Jansens <xor@orodu.net>
Copyright (C) 2002-2006  Derek Foreman and Ben Jansens



                           Build and Installation

                                From tarball

Obtain libburn-1.5.6.tar.gz, take it to a directory of your choice and do:

   tar xzf libburn-1.5.6.tar.gz
   cd libburn-1.5.6
   ./configure --prefix=/usr

To make libburn accessible for running and application development,
and to install the cdrecord compatibility binary cdrskin, do
(as Superuser):

   make install

This procedure installs libburn.so.4 and cdrskin depending on it.
For a standalone cdrskin binary, see cdrskin/README.

A behavioral conflict is known between any burn software and demons like hald
which probe CD drives. This can spoil burn runs for CD-R or CD-RW.
You may have to keep your hald away from the drive. See for example

                                  From git

Our build system is based on autotools. For preparing the build of a git
snapshot you will need autotools of at least version 1.7. 
Do in a directory of your choice:

   git clone https://dev.lovelyhq.com/libburnia/libburn.git libburn-git
   cd libburn-git
   ./configure --prefix=/usr
   make install

Warning: The master branch might contain experimental features which might
         not persist until next release. 

                        Special ./configure options

make install on GNU/Linux will try to run program ldconfig with the library
installation directory as only argument. Failure to do so will not abort
installation. One may disable ldconfig by ./configure option:

In some situations Linux may deliver a better write performance to drives if
the track input is read with O_DIRECT (see man 2 open). The API call
burn_os_open_track_src() and the input readers of cdrskin and libburn fifo
can be told to use this peculiar read mode by:

But often libburn call burn_write_opts_set_dvd_obs(opts, 64*1024) will yield
even better performance in such a situation. 64k can be made default at
configure time by:
This may be combined with above --enable-track-src-odirect .

If it is desired that DVD DAO writing and stdio: writing get padded up to
a full write chunk of 32k or 64k, then use ./configure option:

Alternatively the transport of SCSI commands can be done via libcdio-0.83.
You may install it and re-run libburn's ./configure with option

By use of a version script, the libburn.so library exposes no other function
names but those of the API definition in libburn/libburn.h.
If -Wl,--version-script=... makes problems with the local compiler, then
disable this encapsulation feature by

Make sure to re-compile all source files after running ./configure
   make clean ; make
   make install

Linux only:

libburn tries to avoid a collision with udev's drive examination by waiting
0.1 seconds before opening the device file for a longer time, after udev
might have been alarmed by drive scanning activities.
The waiting time can be set at ./configure time with microsecond granularity.
E.g. 2 seconds:
  CFLAGS="$CFLAGS -DLibburn_udev_wait_useC=2000000"
  ./configure ...options...
Waiting can be disabled by zero waiting time:
  CFLAGS="$CFLAGS -DLibburn_udev_wait_useC=0"
Alternatively, libburn can try to be nice by opening the device file,
closing it immediately, waiting, and only then opening it for real:
  CFLAGS="$CFLAGS -DLibburn_udev_extra_open_cyclE -DLibburn_udev_wait_useC=500000"


The other parts of the the libburnia project are hosted as neighbors of

  git clone https://dev.lovelyhq.com/libburnia/libisofs.git
  git clone https://dev.lovelyhq.com/libburnia/libisoburn.git

See README files there.


                        Overview of libburnia-project.org

libburnia-project.org is an open-source software project for reading, mastering
and writing optical discs.
For now this means CD media, all DVD media, all BD media.

The project comprises of several more or less interdependent parts which
together strive to be a usable foundation for application development.
These are libraries, language bindings, and middleware binaries which emulate
classical (and valuable) Linux tools.
Currently it is supported on GNU/Linux with kernels >= 2.4,
on FreeBSD with ATAPI/CAM enabled in the kernel (see man atapicam),
on OpenSolaris (tested with kernel 5.11),
on NetBSD (tested with 6.1.3).
On other X/Open compliant systems there will only be pseudo drives, but no
direct MMC operation on real CD/DVD/BD drives.

For full ports to other systems we would need : login on a development machine
or a live OS on CD or DVD, advise from a system person about the equivalent
of Linux sg or FreeBSD CAM, volunteers for testing of realistic use cases.

We have a well tested code base for burning data and audio CDs, DVDs and BDs.
The burn API is quite comprehensively documented and can be used to build a
presentable application.
We have a functional application which emulates the core use cases of cdrecord
in order to prove that usability, and in order to allow you to explore
libburn's scope by help of existing cdrecord frontends.

ISO 9660 filesystems with Rock Ridge and Joliet extensions can be created
and manipulated quite freely. This capability together with our burn capability
makes possible a single binary application which covers all steps of image
composition, updating and writing. Quite unique in the Linux world.

The project components (list subject to growth, hopefully):

- libburn  is the library by which preformatted data get onto optical media.
           It uses either /dev/sgN (e.g. on kernel 2.4 with ide-scsi) or
           /dev/srM or /dev/hdX (e.g. on kernel 2.6).
           libburn is the foundation of our cdrecord emulation. Its code is
           independent of cdrecord. Its DVD capabilities are learned from
           studying the code of dvd+rw-tools and MMC-5 specs. No code but only
           the pure SCSI knowledge has been taken from dvd+rw-tools, though.

- libisofs is the library to pack up hard disk files and directories into a
           ISO 9660 disk image. This may then be brought to CD via libburn.
           An own ISO 9660 extension stores ACLs, xattr, and MD5 of file

- libisoburn is an add-on to libburn and libisofs which coordinates both and
           also can grow ISO-9660 filesystem images on multi-session media
           as well as on overwriteable media via the same API.
           All media peculiarities are handled automatically.
           It also contains the methods of command oriented application
           xorriso and offers them via a C language API.

- cdrskin  is a limited cdrecord compatibility wrapper for libburn.
           cdrecord is a powerful GPL'ed burn program included in Joerg
           Schilling's cdrtools. cdrskin strives to be a second source for
           the services traditionally provided by cdrecord. Additionally it
           provides libburn's DVD capabilities, where only -sao is compatible
           with cdrecord.
           cdrskin does not contain any bytes copied from cdrecord's sources.
           Many bytes have been copied from the message output of cdrecord
           runs, though.
           See cdrskin/README for more.

- xorriso  is an application of all three libraries which creates, loads,
           manipulates and writes ISO 9660 filesystem images with
           Rock Ridge extensions. Manipulation is not only adding or
           overwriting of files but also deleting, renaming, attribute
           changing, incremental backups, activating boot images, and
           extracting of files from ISO images to disk. There is also a
           sparse emulation of cdrecord and a more laborate one of mkisofs.
           All features of xorriso are also available via a C language API
           of libisoburn.
           A static compilation of xorriso and the libraries is dedicated
           to the GNU Operating System. See xorriso/README_gnu_xorriso .

- "test"   is a collection of application gestures and examples given by the
           authors of the library features. The burn API example of libburn
           is named test/libburner.c . The API for media information inquiry is
           demonstrated in test/telltoc.c .
           Explore these examples if you look for inspiration.

We strive to be a responsive upstream.

Our libraries are committed to maintain older feature sets in newer versions.
This applies to source code headers (API) as well as to linkable objects (ABI).
The only exception from this rule is about non-release versions x.y.*[13579]
which are allowed to introduce new features, change those new features in
any way and even may revoke such new features before the next release of
x.y.*[02468]. As soon as it is released, a feature is promised to persist.

libburn.so.4    (since 0.3.4, March    2007),
libisofs.so.6   (since 0.6.2, February 2008),
libisoburn.so.1 (since 0.1.0, February 2008).

Applications must use 64 bit off_t. E.g. by defining
#define _FILE_OFFSET_BITS 64
or take special precautions to interface with the libraries by 64 bit integers
where the .h files prescribe off_t. To reduce libburn's off_t size to 32 bit
will keep it from processing tracks of more than 2 GB size.

Project history as far as known to me:

- Founded in 2002 as it seems. See mailing list archives
  The site of this founder team is reachable and offers download of a
  (somewhat outdated) tarball and from CVS :
  Copyright holders and most probably founders:
  Derek Foreman and Ben Jansens.

- I came to using libburn in 2005. Founded the cdrskin project and submitted
  necessary patches which were accepted or implemented better. Except one
  remaining patch which prevented cdrskin from using vanilla libburn from CVS.
  The cdrskin project site is reachable and offers download of the heavily
  patched (elsewise outdated) tarball under the name  cdrskin-0.1.2  :
  It has meanwhile moved to use vanilla libburn.pykix.org , though.
  Version 0.1.4 constitutes the first release of this kind.

- In July 2006 our team mate Mario Danic announced a revival of libburn
  which by about nearly everybody else was perceived as unfriendly fork.
  Derek Foreman four days later posted a message which expressed his
  The situation first caused me to publicly regret it and then - after i
  got the opportunity to move in with cdrskin - gave me true reason to
  personally apologize to Derek Foreman, Ben Jansens and the contributors at 
  icculus.org/burn. Posted to both projects:

- Mid August 2006 project cdrskin established a branch office in 
  libburn.pykix.org so that all maintainers of our tools have one single place
  to get the current (at least slightely) usable coordinated versions of
  Project cdrskin will live forth independendly for a while but it is committed
  to stay in sync with libburn.pykix.org (or some successor, if ever).
  cdrskin is also committed to support  icculus.org/burn  if the pending fork
  is made reality by content changes in that project. It will cease to maintain
  a patched version of  icculus.org/burn  though. Precondition for a new
  release of cdrskin on base of  icculus.org/burn  would be the pending
  "whitelist patch" therefore.
  I would rather prefer if both projects find consense and merge, or at least
  cooperate. I have not given up hope totally, yet.
  I, personally, will honor any approach.

- 2nd September 2006 the decision is made to strive for a consolidation of
  copyright and a commitment to GPL in a reasonable and open minded way.
  This is to avoid long term problems with code of unknown origin and
  with finding consense among the not so clearly defined group of copyright
  claimers and -holders.
  libisofs is already claimed sole copyright Mario Danic.
  cdrskin and libburner are already claimed sole copyright Thomas Schmitt.
  Rewrites of other components will follow and concluded by claiming full
  copyright within the group of libburn.pykix.org-copyright holders.

- 16th September 2006 feature freeze for release of libburn-0.2.2 .

- 20th September 2006 release of libburn-0.2.2 .

- 26th October 2006 feature freeze for cdrskin-0.2.4 based on libburn-0.2.3 .
  This version of cdrskin is much more cdrecord compatible in repect
  to drive addressing and audio features.

- 30th October 2006 release of cdrskin-0.2.4 .

- 13th November 2006 splitting releases of libburn+cdrskin from libisofs.

- 24th November 2006 release of libburn-0.2.6 and cdrskin-0.2.6 . cdrskin has
  become suitable for unaware frontends as long as they perform only the core 
  of cdrecord use cases (including open-ended input streams, audio, and

- 28th November 2006 the umbrella project which encloses both, libisofs and
  libburn, is now called libburnia. For the origin of this name, see 
  http://en.wikipedia.org/wiki/Liburnians .

- 16th January 2007 release of libburn-0.3.0 and cdrskin-0.3.0 . Now the scope
  is widened to a first class of DVD media: overwriteable single layer types
  DVD-RAM, DVD+RW, DVD-RW. This is not a cdrecord emulation but rather inspired
  by dvd+rw-tools' "poor man" writing facility for this class of media.
  Taking a bow towards Andy Polyakov.

- 11th February 2007 version 0.3.2 covers sequential DVD-RW and DVD-R with
  multi-session and with DAO.

- 12th March 2007 version 0.3.4 supports DVD+R and thus covers all single layer
  DVD media. Code for double layer DVD+/-R is implemented but awaits a tester

- 23th April 2007 version 0.3.6 follows the unanimous opinion of Linux kernel
  people that one should not use /dev/sg on kernel 2.6.

- 31st July 2007 version 0.3.8 marks the first anniversary of libburn revival.
  We look back on improved stability, a substantially extended list of media
  and write modes, and better protection against typical user mishaps.

- 24th October 2007 version 0.4.0 is the foundation of new library libisoburn
  and an upcoming integrated application for manipulating and writing
  ISO 9660 + Rock Ridge images. cdrskin-0.4.0 got capabilities like growisofs
  by these enhancements: growing of overwriteable media and disk files.
  Taking again a bow towards Andy Polyakov.

- 26th Januar 2008 version 0.4.2 rectifies the version numbering so that we
  reliably release libburn.so.4 as should have been done since libburn-0.3.2.
  cdrskin now is by default linked dynamically and does a runtime check
  to ensure not to be started with a libburn which is older than itself.

- 3rd Feb 2008 libisofs-0.2.x (.so.5) has been deprecated.

- 14th Feb 2008 libisofs-0.6.2 permanently replaces the old libisofs-0.2.x. 
  It is the first release of new libisofs.so.6 which will guarantee future
  API/ABI compatibility for its whole feature set.

- 15th Feb 2008 libisoburn-0.1.0 (.so.1) coordinates libisofs and libburn for
  the purpose of ISO image reading and writing. It emulates multi-session on
  overwriteable media. Application xorriso makes use of all three libraries.

- 8th Apr 2008 libburn-0.4.4 has proven to be capable of burning to DVD+R/DL
  and read performance on disk file pseudo-drives has been improved.

- 27th Apr 2008 libisofs-0.6.4 can now read data file content from images
  and can map pieces of disk files onto image files. Image directory iteration
  has been enhanced. Input data streams and extended information have been
  exposed in the API to enable future development.

- 29th Apr 2008 libisoburn-0.1.4 was made more efficient with reading of
  image tree nodes. It now depends on libisofs-0.6.4 and libburn-0.4.4.
  xorriso makes use of new libisofs features by performing incremental
  updates of directory trees and by cutting oversized data files into
  pieces. A primitive single session emulation of cdrecord and mkisofs is

- 10th May 2008 libburn-0.4.6 supports formatting and writing of BD-RE,
  full nominal speed for DVD-RAM and BD-RE. cdrskin has a unified blank
  type with automatic media state recognition.

- 17th May 2008 an old bug with DVD-RAM and now with BD-RE is fixed by
  libburn-0.4.8. So libisoburn can now perform emulation of multisession
  on those media.

- 19th May 2008 libisoburn-0.1.6 brings better table-of-content emulation
  on overwriteble media and disk files.

- 1st Jun 2008 libisofs-0.6.6 fixes some problems around device files.

- 3rd Jun 2008 libisoburn-0.1.8 fixes a bug with overwriteable media.

- 23rd Jun 2008 libisoburn-0.2.0 introduces extraction of files from
  ISO images.

- 16th Jul 2008 libburn-0.5.0 handles systems with no /dev/sr* but only

- 19th Jul 2008 libisoburn/xorriso-0.2.2 can do multi-session in mkisofs
  and cdrecord style. xorriso now can serve underneath growisofs.

- 20th Aug 2008 libburn-0.5.2 revokes the necessity that a drive must be
  enumerable in order to be addressable. Enumeration is enhanced by examining
- 24th Aug 2008 libisoburn/xorriso-0.2.4 introduces a media readability check
  with data retrieval option.

- 18th Sep 2008 libisofs-0.6.8 supports ISO 9660 Level 3 which can represent
  very large data files in the image.

- 20th Sep 2008 libisoburn/xorriso-0.2.6 takes into respect the new Level 3
  capabilities of libisofs. 

- 6th Oct 2008 libburn-0.5.4 adjusts the changes of 0.5.2 to the needs of
  Linux kernel 2.4 and introduces human readable SCSI error messages.

- 6th Oct 2008 libisofs-0.6.10 fixes two bugs which prevented adding and
  manipulation of ISOLINUX boot images.

- 15th Oct 2008 libisoburn/xorriso-0.2.8 can activate and maintain an
  ISOLINUX boot image by an EL Torito boot record.

- 12th Nov 2008 libburn-0.5.6 fixes usage of freed memory by the fifo thread
  of an aborted burn run.

- 26th Nov 2008 libisofs-0.6.12 can produce a ISOLINUX isohybrid MBR on the fly
  and can produce ISO images which resemble old mkisofs images.

- 2nd Dec 2008 libisoburn-0.3.0. xorriso now is ready for exotic character
  sets, for legacy FreeBSD systems which expect an outdated Rock Ridge
  signature, and for producing ISO images with MBR which boot from hard disk
  or USB stick. Three minor bugs were fixed.

- 7th Dec 2008 libburn-0.5.8 prevents a SIGSEGV with weird CD table-of-content
  and improves BD-RE formatting.

- 9th Dec 2008 Our project received a donation from Thomas Weber.

- 2nd Jan 2009 libburn-0.6.0 learned to format BD-R and write to either
  formatted or unformatted BD-R.

- 6th Jan 2009 libisoburn-0.3.2. xorriso can produce and execute commands for
  mounting older sessions from all kinds of media. Pseudo-drives outside the
  /dev/ tree can be addressed without prefix "stdio:". 

- 20th Feb 2009 libburn-0.6.2 source release now compiles out of the box
  on FreeBSD.

- 28 Feb 2009 libisofs-0.6.14 can record ACLs and Extended Attributes xattr
  in its ISO images. 

- 01 Mar 2009 libisoburn-0.3.4. xorriso makes use of the ACL and xattr
  capabilities provided by libisofs for xorriso backup features.

- 11 Mar 2009 libisofs-0.6.16 of libisofs fixes two bugs which on Solaris
  prevented to navigate the ISO images by ".." and to recognize the Rock Ridge
  extensions of ISO images. The ban to build libisofs on operating systems
  other than Linux and FreeBSD has been lifted.

- 13 Mar 2009 libburn-0.6.4 got a dummy adapter for SCSI/MMC command transport.
  It will show no drives and thus libburn will only be able to perform
  operations on "stdio:" pseudo drives. Nevertheless this was precondition
  to lift the ban to build libburn on operating systems other than Linux
  and FreeBSD.

- 16 Mar 2009 libisoburn-0.3.6: xorriso uses RRIP version 1.10 as default 
  in order to be mountable where mkisofs images are mountable.

- 17 Apr 2009 libisofs-0.6.18 introduces content filtering of data files.
  Built-in filters implement compression to formats gzip and zisofs. External
  filter processes can perform arbitrary data conversions like encryption.

- 19 Apr 2009 libisoburn-0.3.8 makes use of the new libisofs capability to
  perform content filtering of data files.

- 08 May 2009 libburn-0.6.6 fixes a bug with aborting on broken output pipe
  and a bug with device scan on FreeBSD.

- 31 May 2009 libisofs-0.6.20 can record hard link relations in ISO images
  and offers support with restoring them to disk. Current Linux kernels will
  mount images with such hard links but will attribute a unique inode number
  to each file.

- 28 Jun 2009 libisoburn-0.4.0: xorriso can record and restore hard link
  relations of files. Performance of data reading has been improved. Option
  -find now supports logical operators with its tests.

- 14 Jul 2009 libburn-0.6.8 fixes bugs and shortcommings with old MMC-1 drives
  and with large SCSI bus numbers as handed out by Linux for USB drives.

- 20 Jul 2009 libisoburn-0.4.0.pl01 fixes a regression in xorriso which caused
  data loss in older sessions if xorriso was used underneath growisofs.
  Affected are releases since libisoburn-0.3.2 in january 2009.

- 25 Aug 2009 libisofs-0.6.22 can record MD5 checksums for the whole session
  and for each single data file. Checksum tags can be used to verify superblock
  and directory tree before importing them.

- 27 Aug 2009 libburn-0.7.0 learned to calm down a drive and to inquire its
  supported profiles. It works around some pitfalls with U3 enhanced memory
  sticks which emulate a CD-ROM.

- 27 Aug 2009 libisoburn-0.4.0.pl00 can record MD5 checksums by which one may
  verify the session or single data files in the image. When comparing image
  files with files in the local filesystem, the MD5 sums avoid the need for
  reading file content from the image.

- 22 Sep 2009 libisoburn-0.4.0.pl01 fixes a bug in xorriso option -cut_out.

- 08 Oct 2009 libisofs-0.6.24 fixes a bug which could cause the loss of blanks
  in file names when a new session got added to an ISO image. With names
  shorter than 251 characters this happened only to trailing blanks.

- 08 Oct 2009 libisoburn-0.4.0.pl02 fixes bugs with xorriso option -for_backup,
  with xorrisofs -help, and with xorrecord -help.

- 12 Oct 2009 libburn-0.7.2 fixes a bug with CD TAO multi-track dummy sessions.
  It can retrieve media product info and can process track input which was
  prepared for CD-ROM XA Mode 2 Form 1. cdrskin now performs option -minfo.

- 28 Oct 2009 libisoburn-0.4.4 fixes a bug with cdrecord emulation and
  introduces new information options about media type and ISO image id strings.
  On Linux it helps with mounting two sessions of the same media

- 12 Nov 2009 libburn-0.7.2.pl01 works around problems with Pioneer DVR-216D.
  DVD-R runs made the drive stuck. Ejecting the tray did not work properly.

- 06 Dec 2009 libburn-0.7.4 works around problems with newer DVD burners,
  provides throughput enhancements with hampered busses on Linux, and new
  API calls to log SCSI commands and to control the libburn fifo.

- 09 Dec 2009 libisoburn-0.4.6 now offers performance tuning of output to DVD
  drives or disk files.

- 26 Dec 2009 libburn-0.7.4.pl01 fixes the release tarball which was lacking
  the files of the generic system adapter for X/Open.

- 29 Dec 2009 Our project received a donation for purchasing a fine small
  computer which shall serve as OS farm for development and support.

- 20 Jan 2010 Version 0.6.26 of libisofs fixes minor bugs and shall enhance

- 22 Jan 2010 libburn-0.7.6 has an improved system adapter for FreeBSD,
  fixes bugs about the generic X/Open system adapter, and can use
  libcdio >= 0.83 as SCSI transport facility.

- 10 Feb 2010 libisofs-0.6.28 fixes a regression about bootable images which
  was introduced by version 0.6.22 in August 2009.

- 23 Feb 2010 libisoburn-0.5.0 marks the transition of the xorriso standalone
  version to an official GNU project. The name changed to "GNU xorriso" and its
  license is now GPLv3+.
  The licenses of libburnia libraries and applications are not affected by
  this change. 

- 10 Mar 2010 libburn-0.7.8 fixes bugs and improves the built-in abort handler
  on FreeBSD.

- 30 Mar 2010 Release 0.5.2 of libisoburn provides xorriso documentation in
  GNU Texinfo format with embedded extra data to derive a full man page.

- 09 Apr 2010 libburn-0.8.0 now works with ahci driver on FreeBSD 8-STABLE.

- 03 May 2010 Version 0.6.32 of libisofs is able to create ISO images with
  multiple boot images. All boot catalog parameters described in El-Torito
  specs can be set and inquired. This was needed to use GRUB boot images
  for EFI. 

- 04 May 2010 Release 0.5.6.pl00 of libisoburn makes use of the new libisofs
  capabilities about boot images.

- 11 Jun 2010 libburn-0.8.2 now works on Solaris. 

- 14 Jun 2010 By release 0.5.8.pl00 of libisoburn, xorriso becomes a public C
  language API of libisoburn. The emulations of mkisofs and cdrecord have
  been enhanced. 

- Tue Jun 29 2010 Version 0.6.34 of libisofs provides new features about
  hiding file names from directory trees.

- Wed Jun 30 2010 libburn-0.8.4 removes some restrictions on operating
  systems other than Linux and FreeBSD.

- Fri Jul 02 2010 Release 0.6.0.pl00 of libisoburn adds more options to the
  mkisofs emulation of xorriso. It also fixes minor bugs and shortcommings.

- Wed Sep 15 2010 Version 0.6.36 of libisofs can produce ISO images which
  bear a partiton 1 with non-zero start address. They can be mounted from
  USB stick via the main device file (e.g. /dev/sdb) as well as via the
  partition device file (e.g. /dev/sdb1).

- Fri Sep 17 2010 libburn-0.8.6 lifts the test reservation on DVD-R DL media.

- Sat Sep 18 2010 Release 0.6.2.pl00 of libisoburn introduces a partition
  with non-zero offset for ISO 9660 images on USB sticks, improves mkisofs
  emulation, and fixes a regression which existed since version 0.4.2.

- Wed Oct 20 2010 libburn-0.8.8 can report the used amount of BD spare blocks.

- Sat Oct 23 2010 Version 0.6.38 of libisofs can use libjte to produce jigdo
  files along with the ISO image. Further filesystem images may be appended
  as MBR partitions 1 to 4. The capability was added to produce boot blocks
  for computers with MIPS CPU.

- Tue Oct 26 2010 Release 0.6.4.pl00 of libisoburn and xorriso makes use of
  the new libisofs capabilities.

- Wed Dec 08 2010 libburn-0.9.0 fixes a regression with SCSI command logging.

- Fri Dec 10 2010 Version 0.6.40 of libisofs makes the prediction of the
  emerging image size less expensive and is able to make images bootable
  for SUN SPARC systems.

- Sun Dec 12 2010 Release 0.6.6.pl00 of libisoburn and xorriso can read ISO
  images which were copied to a different start address than they were prepared

- Mon Jan 17 2011 we go for release 1.0.0. This does not indicate a
  technological overhaul but shall emphasize the maturity of the software.
  libisofs-1.0.0 fixes a bug about the length of ECMA-119 directory names and
  is ready to store untranslated ECMA-119 names (violating the specs).
  libburn-1.0.0.pl00 is now willing to create stdio-drive files with
  rw-permissions for all, if umask really asks for it. cdrskin now refuses
  to burn if the foreseeable size exceeds media capacity
  libisoburn-1.0.0.pl00 can now create an ISO 9660:1999 directory tree,
  improved the emulation fidelity of command -as mkisofs, lowered the default
  abort threshold for xorriso batch mode, and increased that threshold for
  xorriso dialog mode.

- Wed Feb 23 2011 release 1.0.2:
  libisofs fixes several bugs and introduces the capability to copy files
  inside the ISO filesystem.
  libburn removed a compilation obstacle on Solaris 9 and improved recognition
  of stdio pseudo-drives.
  libisoburn and xorriso fix bugs and make use of the new libisofs capability.
  xorriso improves its mkisofs emulation.

- Thu Mar 10 2011 release 1.0.4:
  Several bugs were fixed in the libraries and in the mkisofs emulation of
  xorriso. This emulation xorrisofs has now an own man page and info document.

- Sat Apr 09 2011 release 1.0.6:
  libburn refined its representation of emulated drives. The size alignment
  of DVD DAO is now 2 kB rather than 32 kB. libisofs produces Joliet names of
  up to 103 characters. xorriso fixes two bugs and makes use of the library

- Thu Apr 14 2011 release libisoburn-1.0.8:
  A bug in the mkisofs emulation of xorriso could cause options to be ignored.
  The problem was freshly introduced with libisoburn-1.0.6. 

- Fri May 13 2011 release libisofs-1.0.8:
  Fixes a few rarely occurring bugs that have been found during the last month.

- Sat Jun 18 2011 release 1.1.0:
  The consumption of stack memory was reduced. Statical program analysis found
  some rarely occurring memory leaks. Several small bugs were fixed.
  The suffix .plXY was dropped from tarball names of libburn and libisoburn.

- Mon Jun 20 2011 patch release libburn-1.1.0.pl01:
  libburn-1.1.0 compiled only on Linux, FreeBSD, and Solaris, but not on
  other X/Open compliant systems.

- Fri Jul 08 2011 release libisofs-1.1.2 and libisoburn-1.1.2:
  A severe regression was fixed in libisoburn and xorriso, which was introduced
  with version 1.0.6. It caused ISO 9660 images to be unreadable if they were
  written to a write-only random-access file. E.g. by: xorrisofs ... >image.iso
- Mon Aug 08 2011 release 1.1.4:
  Several bugs were fixed in libburn. The most severe of them prevented xorriso
  on some drives from burning mountable ISO 9660 images to CD media.
  New means to list drives by their udev symbolic links help to deal with
  the non-persistent drive addresses on modern GNU/Linux.

- Tue Sep 27 2011 release 1.1.6:
  libisoburn now comes with a test suite. See releng/README. Bugs were fixed
  in several rarely used features. Processing of ACL and extattr was enabled
  on FreeBSD. Workarounds try to cope with vanishing udev links on GNU/Linux.

- Mon Nov 21 2011 release libburn-1.1.8 and libisoburn-1.1.8:
  libburn avoids to close and open drive device files while operating on them.
  xorriso emulation mode xorrecord now has an own manual. libburn and xorriso
  were prepared to operate on qemu virtio-blk-pci devices.

- Sat Jan 28 2012 release 1.2.0:
  libburn has learned to read and write CD-TEXT with CD SAO audio sessions.
  It can now read CDRWIN .cue files which define pure audio or pure data
  sessions. libisofs and libisoburn improved timestamp handling. Several
  minor bugs were fixed.

- Mon Apr 02 2012 release 1.2.2:
  The handling of intentional deviations from ECMA-119 specifications has
  been improved in libisofs. libisoburn and xorriso now make use of these
  improvements. Some rarely occurring bugs have been fixed.  

- Fri Jul 20 2012 release 1.2.4:
  libburn and libisofs got some rarely occurring bugs fixed. libisofs learned
  to produce HFS+ metadata and Apple Partition Map. The capabilities of
  isohybrid options --efi and --mac have been implemented (GPT and APM).

- Tue Jan 08 2013 release 1.2.6:
  Small improvements were made in libburn. Minor bugs were fixed in the
  libraries. xorriso improved its capabilities to serve the needs of frontend
  programs. A proof of concept for a GUI frontend has been implemented:

- Mon Mar 18 2013 release 1.2.8:
  Some rarely occurring bugs were fixed in libisofs and libburn. libburn's
  handling of incomplete sessions has been improved. xorriso's mkisofs
  emulation learned to set El Torito section id strings.

- Fri May 17 2013 release 1.3.0:
  Several bugs were fixed in the libraries and in xorriso. The recently
  introduced new boot preparation capabilities have been tested. New
  boot preparation options for GRUB2 were added.

- Fri May 31 2013 patch release libburn-1.3.0.pl01:
  cdrskin -msinfo on DVD and BD reported as old session start the same
  number as the next writable address.
  Regression introduced by version 1.2.8.

- Fri Aug 07 2013 release 1.3.2:
  cdrskin has acquired the capability to copy audio tracks to .wav files.
  It can extract CD-TEXT in a form that is readable for humans and for
  cdrskin itself. Several small bugs were fixed in xorriso. Its capabilities
  to serve frontend programs in dialog mode have been improved.

- Thu Dec 12 2013 release 1.3.4:
  A long standing hidden bug was fixed, which affected inspection of
  unformatted DVD+RW.
  xorriso now by default puts EL Torito boot images to low block addresses.
  It can report and set read speeds. Several rarely occurring bugs were fixed.

- Tue Mar 04 2014 release 1.3.6:
  libburn learned to operate optical drives and media on NetBSD. libisofs got
  a bug fix about HFS+ and enhancements about character set conversion.
  Minor bugs were fixed in libisoburn. xorriso can now find files with names
  which cannot be represented unchanged in ECMA-119, Joliet, or HFS+. 

- Sat Jun 28 2014 release 1.3.8:
  libburn got several bugs fixed. libisofs offers new API calls for inspection
  of boot sectors in ISO 9660 filesystems. xorriso improved its support for
  NetBSD, offers new features with command -find, and a command to extract
  ISO 9660 file content onto standard output or into filter processes.

- Sun May 17 2015 release 1.4.0:
  This release is mainly about bug fixes and a new feature of xorriso to
  propose commands or as_mkisofs options which can reproduce the boot
  equipment of the loaded ISO filesystem.

- Sat Nov 28 2015 release 1.4.2:
  libburn got some bugs fixed and learned to inquire the drive serial number.
  libisofs now sorts data file content by ECMA-119 file names for better
  reproducability of ISO content. Rock Ridge filenames may be restricted to
  lengths between 64 and 255 bytes. If needed, a qualified truncation happens.
  xorriso now can replay boot settings when modifying ISO filesystems.
  In order to avoid clogging of concurrent Linux SG_IO, xorriso got command
  -modesty_on_drive to enable an old workaround from IDE master/slave days. 
  The source code underwent a scan by Coverity. About 150 code changes
  resulted, but no easy-to-trigger bugs were found.
- Fri Jan 29 2016 patch release libburn-1.4.2.pl01:
  cdrskin did not work with "-" (stdin) as input.
  Regression introduced by version 1.4.2.

- Fri Jul 01 2016 release 1.4.4:
  The capability to use Linux /dev/sg was revived in order to circumvent the
  sr_mutex lock which hampers concurrent use of optical drives via SG_IO.
  libisofs now can use appended partitions by El Torito, avoiding the need
  for duplicate EFI System Partition images.
  Several bugs have been fixed.

- Fri Sep 16 2016 release 1.4.6:
  libburn now operates optical drives on OpenBSD. libisofs makes pseudo-random
  id generation reproducible by relating it to the volume date.
  xorriso interprets environment variable SOURCE_DATE_EPOCH of
  reproducible-builds.org to prepare a default setting which leads to identical
  ISO images on identical input and identical constant options.
  Several moderately embarrassing bugs have been fixed.

- Tue Sep 12 2017 release 1.4.8:
  libburn now refuses to write to SRM+POW formatted BD-R, because it would
  spoil them. libisofs got several bugs fixed and offers new API calls to
  support new xorriso features. libisoburn and xorriso offer more detail
  control with particular boot sector types. New bugs and a regression from
  version 1.4.4 were fixed.

- Sat Sep 15 2018 release 1.5.0
  libisofs now can record all xattr namespaces, user defined padding was moved
  after appended partitions. libisoburn and xorriso make use of the new xattr
  capability of libisofs.
  All three libraries got some rarely triggered bugs fixed.

- Sat Oct 26 2019 release 1.5.2
  The libraries are now ready for building out-of-source. libisofs got minor
  API extensions. libburn got a bug fixed which spoiled burn runs on
  some MATSHITA laptop drives. It is now able to list all features which
  the drive announces. xorriso can now set GPT type GUIDs with appended
  partitions and the ISO partition.
  All three libraries got some rarely triggered bugs fixed.

- Mon Nov 25 2019 patch release 1.5.2.pl01
  cdrskin did not properly burn multiple tracks. Track 1 was slow and burning
  stalled before track 2. Regression introduced by 1.5.0.

- Sat Jan 30 2021 , 07 Feb 2021 release 1.5.4
  libburn offers new opportunities to influence drive speed. 
  libisofs got a bug fixed which under medium rare circumstances spoiled 
  zisofs production. libisofs switched to usage of libjte-2.0.0. Further it 
  can now write and read zisofs2 format, which enables compression of files 
  >= 4 GiB. When reading Joliet file trees, the names get stripped of their 
  version numbers by default. After loading metadata, libisofs can now tell 
  which directory tree was loaded and whether Rock Ridge is used. 
  libisoburn and xorriso make use of these new features.
  xorriso can put out the data stream of -check_media to standard output. It
  can restore files with many zero bytes as sparse files and it is able to
  extract recognized boot images into data files on hard disk.
  A new script xorriso-dd-target helps to put an ISO image onto an USB stick
  without endangering valuable hard disk content.
  Several rarely triggered bugs were fixed.

- Wed Jun 07 2023 release 1.5.6
  libburn can overburn CD media, i.e. write more data than the drive announced
  as medium capacity.
  libisofs can assess many of the features which were in effect when a
  given ISO 9660 filesystem was created. A safety limit was introduced not
  to exceed the limit of Linux which is imposed on the number of SUSP CE
  entries which is good for about 60 KiB of AAIP data. Some rarely occuring
  bugs were fixed in libisofs.
  libisoburn and xorriso expose the new library features to the user and
  got some minor improvements. Many minor bugs were fixed.


    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 or later
    as published by the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Clarification in my name and in the name of Mario Danic, upcoming copyright
holders on toplevel of libburnia. To be fully in effect after the remaining
other copyrighted code has been replaced by ours and by copyright-free
contributions of our friends:

We, the copyright holders, agree on the interpretation that dynamical linking
of our libraries constitutes "use of" and not "derivation from" our work in
the sense of GPL, provided those libraries are compiled from our unaltered
code or from altered code published under GPL.

So we will not raise legal protest if you link our libraries dynamically with
applications which are not under GPL, or if you distribute our libraries
and application tools in binary form, as long as you fulfill the usual
condition of GPL to offer a copy of their source code -altered or unaltered-
under GPL.

We ask you politely to use our work in open source spirit
and with the due reference to the entire open source community.

If there should really arise the case where above clarification
does not suffice to fulfill a clear and neat request in open source
spirit that would otherwise be declined for mere formal reasons,
only in that case we will duely consider to issue a special license
covering only that special case.
It is the open source idea of responsible freedom which will be
decisive and you will have to prove that you exhausted all own
means to qualify for GPL.

For now we are firmly committed to maintain one single license: GPL.

signed: Mario Danic, Thomas Schmitt
Agreement joined later by: Vreixo Formoso