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On playing disc 2 of the Firefly DVD boxed set, I received this error message:

@mundo:~$ vlc
VLC media player 3.0.21 Vetinari (revision 3.0.21-0-gdd8bfdbabe8)
[0000557621b43400] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[0000557621bd6cb0] main playlist: playlist is empty
[00007fa978001130] dvdnav demux: DVD Title: FIREFLY_D2
[00007fa978001130] dvdnav demux: DVD Serial Number: 2F239444
[00007fa978001130] dvdnav demux: DVD Title (Alternative): FIREFLY_D2
[00007fa978001130] dvdnav demux: DVD disk reports itself with Region mask 0x00fe0000. Regions: 01
[00007fa978001130] dvdnav demux: Attempting to retrieve all CSS keys
[00007fa978001130] dvdnav demux: This can take a _long_ time, please be patient

libdvdnav: Suspected RCE Region Protection!!!
[00007fa978001130] dvdnav demux error: ifoRead_TITLE_VOBU_ADMAP vtsi failed
libdvdnav: Suspected RCE Region Protection!!!

Disc one plays without this problem

System Information
GTK 3.24.48 / GLib 2.82.4
Locale: C (charset: US-ASCII)
Operating System: Linux 6.6.15-amd64 (x86_64)

Is the DVD (or the DVD drive) from a different region? Not much you can do if the drive refuses to play the disk.