Patent ID: 7350082
Filing Date: 2008-03-25
Classification: H04N

Abstract:
1. A method of providing an upgrade for encryption used to encrypt video content stored in a Digital Versatile Disc (DVD) from an old encryption process to a new upgraded encryption process, comprising: selecting a portion of video content for dual partial encryption; dual partial encrypting the video content so that the video content has a clear portion, a portion encrypted using the old encryption process and a portion encrypted using the new upgraded encryption process; storing the dual partial encrypted video content on the DVD so that a first program chain stored on the DVD references the clear portion and the portion encrypted using the old encryption process, and so that a second program chain stored on the DVD references the clear portion and the portion encrypted using the new upgraded encryption process; and wherein encryption can be upgraded from the old encryption process to the new encryption process without modification to the DVD by decryption of the selected portions of the video content encrypted under the old encryption process using the first encryption chain when using a decryption device compatible with the old encryption process and encryption of the selected portions of the video content encrypted under the new encryption process using the new encryption chain when using a decryption device compatible with the new encryption process.