BD-ROM Region Encoding

[Blu-Wave]

It hasn’t been decided yet whether BD-ROMs will be region-coded – although the studios are very keen on it, but unlike HD-DVD, Blu-ray has already chosen its encryption routine for BD-ROMs – using an AES 128-bit key that changes every six kilobytes, with technologies to prevent bit-by-bit copying and bus encryption for BD-ROM drives for PCs.

DVD encryption was defeated by DeCSS, but for Blu-ray, if one key is compromised the BDA can simply revoke that key, and only licensed Blu-ray manufacturers can make or copy Blu-ray discs.