Inaccurate DVD IDs on ISO with RCE protection removed

[rlaphoenix]

AnyDVD and possibly others may modify or remove a couple of bytes in the VIDEO_TS.IFO and VTS_01_0.IFO files when removing RCE protection. This results in alternate DVD IDs compared to before, and after modifications.

Detection of an RCE-removed ISO might be possible, or at the very least forcing a reversal of the process by modifying some headers back might be possible. But even if that is possible, knowing if it originally had RCE-protection or not, or to which region, may not be possible to automatically infer.

I have attached an example VIDEO_TS and VTS_01_0 IFO files before and after RCE protection removal.

R1-USA-NTSC-RCE-Kept.tar.gz
R1-USA-NTSC-RCE-Removed.tar.gz