Patent ID: 6418421
Filing Date: 2002-07-09
Classification: G06F,G06Q,H04L,H04W

Abstract:
A method of playing digital content data on a user's system, the content data being compressed and encrypted with a first encrypting key, said method comprising the steps of:generating the first encrypting key and corresponding first decrypting key on the user's system; encrypting the first decrypting key to produce an encrypted first decrypting key that is stored on the user's system; decrypting the encrypted first decrypting key using a second decrypting key; decrypting at least part of the content data with the first decrypting key to produce decrypted content data; decompressing the decrypted content data to produce decompressed content data; and playing or recording the decompressed content data, wherein the second decrypting key is a secret user key that is hidden on the user's system.