How does DVD CSS/CPPM protection actually work?

When I try to burn a DVD with ImgBurn I get a message that the disc is copy protected:

Copyright protection system type: CSS/CPPM

I've been trying to Google on how this protection actually works, all I could find is that there's some secret sectors on the cd that are used for decryption of the data.

However I'm wondering - how is this enforced (someone has to "know" that those sectors should be read by the secret decryption key) - is this some sort of specification on the DVD drive? or perhaps some specification that the operating system "knows" about and therefor decrypts the data successfully?

2

1 Answer

After reading about it on the Wikipedia that user pjc50 posted in his comment, I understand that it's the drive that enforces the encryption.

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