Digital video recorder for encrypting/decrypting video programs in segments to facilitate trick play features
AssigneesKeen Personal Technologies, Inc., Keen Personal Media, Inc.
InventorsWilliam B. Boyle, Alan P. Rice
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Abstract
A digital video recorder (DVR) is disclosed for storing a plaintext video program as an encrypted video program. The DVR comprises a random access storage (RAS) device for storing the encrypted video program in encrypted segments. The DVR further comprises a cryptography facility comprising an encoder for encrypting plaintext segments of the plaintext video program into the encrypted segments stored on the RAS device, and a decoder for randomly and independently decrypting the encrypted segments of the encrypted video program into plaintext segments during playback.
Claims14
A digital video recorder for storing a plaintext video program as an encrypted video program, the digital video recorder comprising:
- (a) a random access storage (RAS) device for storing the encrypted video program in encrypted segments;
- (b) a cryptography facility comprising:
- an encoder for encrypting plaintext segments of the plaintext video program into the encrypted segments stored on the RAS device;
- and
- a decoder for randomly and independently decrypting each encrypted segment of the encrypted video program into a plaintext segment during playback.
A method for processing a video program in a digital video recorder comprising a random access storage (RAS) device, the method comprising the steps of:
- (a) encrypting plaintext segments of a plaintext video program into encrypted segments;
- (b) storing the encrypted segments on the RAS device;
- (c) randomly reading the encrypted segments from the RAS device;
- and
- (d) independently decrypting each encrypted segment into a plaintext segment.
Dependencies are inferred from the claim text.