06853731 is referenced by 135 patents and cites 4 patents.

The present invention may be regarded as a digital video recorder (DVR) comprising a storage device for storing an encrypted video program, a unique ID for interlocking the encrypted video program with the digital video recorder, and a cryptography facility. The cryptography facility comprises an encoder, responsive to the unique ID, for encrypting a plaintext video program into the encrypted video program stored on the storage device, and a decoder, responsive to the unique ID, for decrypting the encrypted video program stored on the storage device into the plaintext video program during playback.

Title
Digital video recorder employing a unique ID to interlock with encrypted video programs stored on a storage device
Application Number
9/676635
Publication Number
6853731 (B1)
Application Date
September 30, 2000
Publication Date
February 8, 2005
Inventor
Alan P Rice
Santa Ana
CA, US
William B Boyle
Lake Forest
CA, US
Agent
Howard H Sheerin Esq
Milad G Shara Esq
Assignee
Keen Personal Media
CA, US
Keen Personal Technologies
CA, US
IPC
H04N 007/167
View Original Source