Making a DVD/blu-ray unique?

[FrontierDK]

Hi there

This may be a newbie question but here goes anyways (others may bennefit as well):

When I author a DVD using DVDcomposer or a blu-ray using Scenarist BD, the following always happens: if the LG blu-ray player has it's power removed, any first inserted DVD/blu-ray disk acts as intended. BUT...any home-made disk after that, and the player will "see" it as the previous disk (despite being a completely different no-identical-contents disk, resulting in "resuming" somewhere odd.

This does not happen with commercial disks. Now what the heck do I need to do in order for this not to happen? Disk label is unique, volume descriptor is unique etc...

[Video Dude]

This does not happen with commercial disks. Now what the heck do I need to do in order for this not to happen? Disk label is unique, volume descriptor is unique etc...

Might be a bug in the LG player.

You don't know how the LG identifies the disc. One explanation is it may use the encryption key. Makes sense because the commercial discs work. The homemade discs you make have no encryption and don't have the unique key so the LG identifies it as the same disc.

[FrontierDK]

Might be a bug in the LG player.

You don't know how the LG identifies the disc. One explanation is it may use the encryption key. Makes sense because the commercial discs work. The homemade discs you make have no encryption and don't have the unique key so the LG identifies it as the same disc.

I have had the same thought. Only...I'm not sure that there's so many DVD encryption keys out there...

Has no one but me experienced this with self-created disks?

[LoRd_MuldeR]

I have had the same thought. Only...I'm not sure that there's so many DVD encryption keys out there...

AACS, the DRM scheme used on BluRay, uses AES-128 encryption, so there are 2^128 = 340282366920938463463374607431768211456 different keys possible.

CSS, the DRM scheme used on Video-DVD, uses "only" 40-Bit keys, but that still allows for 2^40 = 1099511627776 different keys. That should still be more than enough for all DVD's ever released ;)

Though I assume that in practice one would use the "Volume ID" to identify a disc, rather than the actual encryption keys.

(Even a single title can have multiple encryption keys, and there can be various titles on one disc. But there's only one "Volume ID", which is unique to each disc)