When backing up your disc, being able to archive/cache/backup the CSS keys have real value.
- Good for reviewing the CSS keys used
- Comparing with others with same disc to see if anyone has a bad key
- Possible online key database for those who cant use libdvdcss or for those who dont have a matching region disc reader
A popular use case is for accurate decryption of encrypted ISO files by getting the real keys right from the disc. Some times you may be able to get a full accurate backup only as encrypted or from a software that only outputs encrypted discs. For example, using disc image creator to make an archive-ready encrypted backup, then load the CSS keys from the real disc into cache, then use those keys to decrypt the ISO file.
When backing up your disc, being able to archive/cache/backup the CSS keys have real value.
A popular use case is for accurate decryption of encrypted ISO files by getting the real keys right from the disc. Some times you may be able to get a full accurate backup only as encrypted or from a software that only outputs encrypted discs. For example, using disc image creator to make an archive-ready encrypted backup, then load the CSS keys from the real disc into cache, then use those keys to decrypt the ISO file.