diff --git a/libisoburn/trunk/xorriso/xorriso.1 b/libisoburn/trunk/xorriso/xorriso.1
index d99967b2..8d777b0b 100644
--- a/libisoburn/trunk/xorriso/xorriso.1
+++ b/libisoburn/trunk/xorriso/xorriso.1
@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "Dec 10, 2008"
+.TH XORRISO 1 "Dec 13, 2008"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -561,6 +561,14 @@ until the next -dev or -indev. After the image has been loaded once, the
 setting is valid for -rollback until next -dev or -indev, where it
 will be reset to "auto".
 .TP
+\fB\-assert_volid\fR pattern severity
+Refuse to load ISO images with volume ids which do not match the given
+search pattern. When refusing an image, give up the input drive and issue
+an event of the given severity. An empty search pattern accepts any image.
+.br
+This option does not hamper the creation of an empty image from blank
+input media and does not discard an already loaded image.
+.TP
 \fB\-in_charset\fR character_set_name
 Set the character set from which to convert file names when loading an
 image. This has eventually to be done before specifying -dev , -indev or
@@ -2834,16 +2842,17 @@ Seconds since Jan 1 1970:
 .B =1194531416
 .SS
 .B Incremental backup of a few directory trees
-This does the following to directories /open_source_project and /personal_mail
-in the ISO image:
-create them if not existing yet,
-compare them with their disk counterparts,
-add disk file objects which are missing yet,
-overwrite those which are different on disk,
-and delete those which have vanished on disk.
-But do not add or overwrite files matching *.o, *.swp.
+This changes the directory trees /open_source_project and /personal_mail
+in the ISO image so that they become exact copies of their disk counterparts.
+ISO file objects get created, deleted or get their attributes adjusted
+accordingly.
+Files with names matching *.o or *.swp get excluded explicitely.
 .br
-\fB$\fR xorriso -dev /dev/sr0 \\
+Only media with the expected volume id or blank media are accepted.
+.br
+\fB$\fR xorriso -assert_volid 'PROJECTS_MAIL_*' FATAL \\
+.br
+ -dev /dev/sr0 \\
 .br
  -volid PROJECTS_MAIL_"$(date '+%Y_%m_%d_%H%M%S')" \\
 .br
diff --git a/libisoburn/trunk/xorriso/xorriso.c b/libisoburn/trunk/xorriso/xorriso.c
index 001b27bd..7135a0d0 100644
--- a/libisoburn/trunk/xorriso/xorriso.c
+++ b/libisoburn/trunk/xorriso/xorriso.c
@@ -1745,6 +1745,31 @@ int Sregex_resolve_var(char *form, char *vars[][2], int num_vars,
 }
 
 
+/* @param flag bit0= only test expression whether compilable
+*/
+int Sregex_match(char *pattern, char *text, int flag)
+{
+ int ret;
+ char re_text[2*SfileadrL];
+ regex_t re;
+ regmatch_t match[1];
+
+ Xorriso__bourne_to_reg(pattern, re_text, 0);
+ ret= regcomp(&re, re_text, 0);
+ if(ret != 0) 
+   return(-1);
+ if(flag & 1) {
+   regfree(&re);
+   return(1);
+ }
+ ret= regexec(&re, text, 1, match, 0);
+ regfree(&re);
+ if(ret != 0)
+     return(0);
+ return(1);
+}
+
+
 #endif /*  Xorriso_sregex_externaL */
 
 
@@ -3805,8 +3830,10 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  m->do_global_uid= 0;
  m->global_uid= 0;
  strcpy(m->volid, "ISOIMAGE");
- m->loaded_volid[0]= 0;
  m->volid_default= 1;
+ m->loaded_volid[0]= 0;
+ m->assert_volid[0]= 0;
+ m->assert_volid_sev[0]= 0;
  m->publisher[0]= 0;
  m->application_id[0]= 0;
  m->session_logfile[0]= 0;
@@ -6042,7 +6069,16 @@ int Xorriso_status(struct XorrisO *xorriso, char *filter, FILE *fp, int flag)
    if(!(is_default && no_defaults))
      Xorriso_status_result(xorriso, filter, fp, flag & 2);
  }
- 
+
+ is_default= (xorriso->assert_volid[0] == 0);
+ sprintf(line, "-assert_volid ");
+ Text_shellsafe(xorriso->assert_volid, line, 1);
+ strcat(line, " ");
+ Text_shellsafe(xorriso->assert_volid_sev, line, 1);
+ strcat(line, "\n");
+ if(!(is_default && no_defaults))
+   Xorriso_status_result(xorriso,filter,fp,flag&2);
+  
  do_single= 0;
  if(filter != NULL)
    if(strncmp(filter, "-indev", 6) == 0 ||
@@ -10802,11 +10838,6 @@ int Xorriso_option_application_id(struct XorrisO *xorriso, char *name,
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
    return(0);
  }
-
-#ifdef NIX
- Xorriso_set_application_id(xorriso, name, 0);
-#endif
-
  if(Sfile_str(xorriso->application_id,name,0)<=0)
    return(-1);
  return(1);
@@ -10864,6 +10895,51 @@ ex:;
 }
 
 
+/* Option -assert_volid */
+int Xorriso_option_assert_volid(struct XorrisO *xorriso, char *pattern,
+                                char *severity, int flag)
+{
+ int ret, sev;
+ char *sev_text= "";
+
+ if(strlen(pattern)>=sizeof(xorriso->assert_volid)) {
+   sprintf(xorriso->info_text,
+           "Name too long with option -application_id (%d > %d)",
+           (int) strlen(pattern), (int) sizeof(xorriso->assert_volid)-1);
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
+   return(0);
+ }
+ if(pattern[0]) {
+   ret= Sregex_match(pattern, "", 1);
+   if(ret <= 0) {
+     sprintf(xorriso->info_text, "-assert_volid: Cannot use given pattern.");
+     Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+     return(0);
+   }
+ }
+ if(severity[0] != 0 || pattern[0] != 0) {
+   if(severity[0] == 0) {
+     if(strcmp(xorriso->abort_on_text, "NEVER") == 0)
+       sev_text= "ABORT";
+     else
+       sev_text= xorriso->abort_on_text;
+   } else
+     sev_text= severity;
+   ret= Xorriso__text_to_sev(sev_text, &sev, 0);
+   if(ret<=0) {
+     sprintf(xorriso->info_text, "-assert_volid: Not a known severity name : ");
+     Text_shellsafe(severity, xorriso->info_text, 1);
+     Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+     return(ret);
+   }
+ }
+ if(Sfile_str(xorriso->assert_volid, pattern,0) <= 0)
+   return(-1);
+ strcpy(xorriso->assert_volid_sev, sev_text);
+ return(1);
+}
+
+
 /* Option -backslash_codes */
 int Xorriso_option_backslash_codes(struct XorrisO *xorriso, char *mode,
                                    int flag)
@@ -12876,6 +12952,8 @@ int Xorriso_option_help(struct XorrisO *xorriso, int flag)
 "  -rom_toc_scan \"on\"|\"off\"[:\"emul_on\"|\"emul_off\"]",
 "                 Enable scanning for ISO sessions on read-only drives/media",
 "                 resp. on overwriteable media with emulated TOC.",
+"  -assert_volid pattern severity",
+"                 Accept input image only if its volume id matches pattern.",
 "  -charset name  Set the character set name to be used for file name",
 "                 conversion from and to media.",
 "  -in_charset name",
@@ -15373,7 +15451,7 @@ int Xorriso_count_args(struct XorrisO *xorriso, int argc, char **argv,
     ""
  };
  static char arg2_commands[][40]= {
-    "boot_image","compare","compare_r",
+    "assert_volid","boot_image","compare","compare_r",
     "errfile_log","error_behavior","extract","extract_single",
     "load","logfile",
     "map","map_single","page","return_with","update","update_r",
@@ -15537,6 +15615,10 @@ next_command:;
  } else if(strcmp(cmd,"as")==0) {
    ret= Xorriso_option_as(xorriso, argc, argv, idx, 0);
 
+ } else if(strcmp(cmd,"assert_volid")==0) {
+   (*idx)+= 2;
+   ret= Xorriso_option_assert_volid(xorriso, arg1, arg2, 0);
+
  } else if(strcmp(cmd,"backslash_codes")==0) {
    (*idx)++;
    ret= Xorriso_option_backslash_codes(xorriso, arg1, 0);
diff --git a/libisoburn/trunk/xorriso/xorriso.h b/libisoburn/trunk/xorriso/xorriso.h
index 1afcd7e1..5c3a0242 100644
--- a/libisoburn/trunk/xorriso/xorriso.h
+++ b/libisoburn/trunk/xorriso/xorriso.h
@@ -293,6 +293,10 @@ int Xorriso_option_application_id(struct XorrisO *xorriso, char *name,
 int Xorriso_option_as(struct XorrisO *xorriso, int argc, char **argv,
                       int *idx, int flag);
 
+/* Option -assert_volid */
+int Xorriso_option_assert_volid(struct XorrisO *xorriso, char *pattern,
+                                char *severity, int flag);
+
 /* Option -backslash_codes */
 int Xorriso_option_backslash_codes(struct XorrisO *xorriso, char *mode,
                                    int flag);
diff --git a/libisoburn/trunk/xorriso/xorriso_private.h b/libisoburn/trunk/xorriso/xorriso_private.h
index 87718231..1fac8f42 100644
--- a/libisoburn/trunk/xorriso/xorriso_private.h
+++ b/libisoburn/trunk/xorriso/xorriso_private.h
@@ -120,6 +120,8 @@ struct XorrisO { /* the global context of xorriso */
  char volid[33];
  int volid_default;
  char loaded_volid[33];
+ char assert_volid[SfileadrL];
+ char assert_volid_sev[80];
 
  char publisher[129];
  char application_id[129];
@@ -820,5 +822,9 @@ int Sectorbitmap_copy(struct SectorbitmaP *from, struct SectorbitmaP *to,
 /* bit0= append (text!=NULL) */
 int Sregex_string(char **handle, char *text, int flag);
 
+/* @param flag bit0= only test expression whether compilable
+*/
+int Sregex_match(char *pattern, char *text, int flag);
+
 #endif /* Xorriso_private_includeD */
 
diff --git a/libisoburn/trunk/xorriso/xorriso_timestamp.h b/libisoburn/trunk/xorriso/xorriso_timestamp.h
index 98937445..07eff8e0 100644
--- a/libisoburn/trunk/xorriso/xorriso_timestamp.h
+++ b/libisoburn/trunk/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2008.12.13.161650"
+#define Xorriso_timestamP "2008.12.14.093125"
diff --git a/libisoburn/trunk/xorriso/xorrisoburn.c b/libisoburn/trunk/xorriso/xorrisoburn.c
index 62dee326..4b6b62f9 100644
--- a/libisoburn/trunk/xorriso/xorrisoburn.c
+++ b/libisoburn/trunk/xorriso/xorrisoburn.c
@@ -469,6 +469,44 @@ int Xorriso_record_boot_info(struct XorrisO *xorriso, int flag)
 }
 
 
+int Xorriso_assert_volid(struct XorrisO *xorriso, int msc1, int flag)
+{
+ int ret, image_blocks;
+ char volid[33];
+ struct burn_drive_info *dinfo;
+ struct burn_drive *drive;
+
+ if(xorriso->assert_volid[0] == 0)
+   return(1);
+ ret= Xorriso_get_drive_handles(xorriso, &dinfo, &drive,
+                                "on attempt to perform -assert_volid", 0);
+ if(ret<=0)
+   return(0);
+ ret= isoburn_read_iso_head(drive, msc1, &image_blocks, volid, 1);
+ Xorriso_process_msg_queues(xorriso,0);
+ if(ret <= 0) {
+   sprintf(xorriso->info_text,
+           "-assert_volid: Cannot determine Volume Id at LBA %d.", msc1);
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0,
+                       xorriso->assert_volid_sev, 0);
+ }
+ ret= Sregex_match(xorriso->assert_volid, volid, 0);
+ if(ret < 0)
+   return(2);
+ if(ret == 0) {
+   strcpy(xorriso->info_text,
+          "-assert_volid: Volume id does not match pattern: ");
+   Text_shellsafe(xorriso->assert_volid, xorriso->info_text, 1);
+   strcat(xorriso->info_text, " <> ");
+   Text_shellsafe(xorriso->loaded_volid, xorriso->info_text, 1);
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0,
+                       xorriso->assert_volid_sev, 0);
+   return(0);
+ }
+ return(ret);
+}
+
+
 /* @param flag bit0= aquire as isoburn input drive
                bit1= aquire as libburn output drive (as isoburn drive if bit0)
                bit2= regard overwriteable media as blank
@@ -647,6 +685,9 @@ int Xorriso_aquire_drive(struct XorrisO *xorriso, char *adr, int flag)
              "Loading ISO image tree from LBA %d", load_lba);
      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0); 
    }
+   ret= Xorriso_assert_volid(xorriso, load_lba, 0);
+   if(ret <= 0)
+     goto ex;
  }
 
  /* <<< */
@@ -711,18 +752,6 @@ int Xorriso_aquire_drive(struct XorrisO *xorriso, char *adr, int flag)
  if(!(flag&32)) {
    Xorriso_toc(xorriso, 1 | 8);
    if(xorriso->loaded_volid[0]!=0) {
-
-#ifdef NIX
-     sprintf(xorriso->result_line,"Volume id    : '%s'\n",
-             xorriso->loaded_volid);
-     Xorriso_result(xorriso,0);
-     if(strcmp(xorriso->loaded_volid, xorriso->volid)!=0 &&
-        !xorriso->volid_default) {
-       sprintf(xorriso->result_line, "New volume id: '%s'\n", xorriso->volid);
-       Xorriso_result(xorriso,0);
-     }
-#else
-
      sprintf(xorriso->info_text,"Volume id    : '%s'\n",
              xorriso->loaded_volid);
      Xorriso_info(xorriso, 0);
@@ -731,9 +760,6 @@ int Xorriso_aquire_drive(struct XorrisO *xorriso, char *adr, int flag)
        sprintf(xorriso->info_text, "New volume id: '%s'\n", xorriso->volid);
        Xorriso_info(xorriso, 0);
      }
-
-#endif /* ! NIX */
-
    }
  }
  ret= 1+not_writeable;