Encrypting DVD or CDROM from iso

Hi to all,

I'm wondering how to create a DVD or CDROM encrypted using dm-crypt.
I've followed this tutorial, with no luck: 
http://www.sourcentral.org/luks/iso9660/

and the DVD or cdrom created cannot be activated:



     cryptsetup --debug -r luksOpen /dev/sr1 dvdati
     # cryptsetup 2.0.2 processing "cryptsetup --debug -r luksOpen 
/dev/sr1 dvdati"
     # Running command open.
     # Locking memory.
     # Installing SIGINT/SIGTERM handler.
     # Unblocking interruption on signal.
     # Allocating context for crypt device /dev/sr1.
     # Trying to open and read device /dev/sr1 with direct-io.
     # Initialising device-mapper backend library.
     # Trying to load any crypt type from device /dev/sr1.
     # Crypto backend (gcrypt 1.8.1) initialized in cryptsetup library 
version 2.0.2.
     # Detected kernel Linux 5.3.1-050301-lowlatency x86_64.
     # PBKDF pbkdf2, hash sha256, time_ms 2000 (iterations 0), 
max_memory_kb 0, parallel_threads 0.
     # Reading LUKS header of size 1024 from device /dev/sr1
     # Key length 32, device size 2097151 sectors, header size 2050 
sectors.
     # Activating volume dvdati using token -1.
     # Interactive passphrase entry requested.
     Inserire la passphrase per /dev/sr1:
     # Activating volume dvdati [keyslot -1] using passphrase.
     # dm version   [ opencount flush ]   [16384] (*1)
     # dm versions   [ opencount flush ]   [16384] (*1)
     # Detected dm-ioctl version 4.40.0.
     # Detected dm-crypt version 1.19.0.
     # Device-mapper backend running with UDEV support enabled.
     # dm status dvdati  [ opencount flush ]   [16384] (*1)
     # Trying to open key slot 0 [ACTIVE_LAST].
     # Reading key slot 0 area.
     # Using userspace crypto wrapper to access keyslot area.
     Slot di chiave 0 sbloccato.
     # Calculated device size is 2093055 sectors (RW), offset 4096.
     # DM-UUID is CRYPT-LUKS1-fc00404de1784730ae9492929a0db06c-dvdati
     # Udev cookie 0xd4d0652 (semid 10) created
     # Udev cookie 0xd4d0652 (semid 10) incremented to 1
     # Udev cookie 0xd4d0652 (semid 10) incremented to 2
     # Udev cookie 0xd4d0652 (semid 10) assigned to CREATE task(0) with 
flags DISABLE_LIBRARY_FALLBACK         (0x20)
     # dm create dvdati 
CRYPT-LUKS1-fc00404de1784730ae9492929a0db06c-dvdati [ opencount flush ]  
  [16384] (*1)
     # dm reload dvdati  [ opencount flush readonly securedata ]   
[16384] (*1)
     device-mapper: reload ioctl on   failed: Argomento non valido
     # Udev cookie 0xd4d0652 (semid 10) decremented to 1
     # Udev cookie 0xd4d0652 (semid 10) incremented to 2
     # Udev cookie 0xd4d0652 (semid 10) assigned to REMOVE task(2) with 
flags DISABLE_LIBRARY_FALLBACK         (0x20)
     # dm remove dvdati  [ opencount flush readonly securedata ]   
[16384] (*1)
     # Udev cookie 0xd4d0652 (semid 10) decremented to 1
     # Udev cookie 0xd4d0652 (semid 10) waiting for zero
     # Udev cookie 0xd4d0652 (semid 10) destroyed
     # Releasing crypt device /dev/sr1 context.
     # Releasing device-mapper backend.
     # Unlocking memory.
     Comando non riuscito con codice -1 (parametri errati o mancanti).



and also the iso not dockable to the loopback device:

     #cryptsetup -r luksOpen /dev/loop20 volume1
     #The required offset is beyond the actual size of the /dev/loop20 
device




Could you give me a tips for make it working?


Many thanks!


Davide



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