System and method for authenticating software carriers

摘要: A disk player that will play only authorized disks. Predetermined data blocks, including those in the lead-in section of which contain content-related data, are processed to derive an authorization code. The code is stored on encrypted form, using private key a public-key cryptosystem pair. processes same computed code; also uses paired public decrypt disk. Play ensues if decrypted matches technique can be used control not as whole, but certain specific modes.