Method and system of key-coding a video
First Claim
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1. A method comprising:
- encrypting each of a plurality of sections of a video with a respective encrypt key from a sequence of encrypt keys;
for each encrypt key defining a respective set of at least one decrypt key, at least some of the sets containing at least two decrypt keys of varying perfectiongenerating a plurality of sequences of decrypt keys that correspond to the sequence of encrypt keys, each sequence comprising a respective decrypt key from each set of at least one decrypt key, the keys from sets containing at least two decrypt keys being selected to encode information specific to that sequence of decrypt keys.
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Abstract
A system and a method for encrypting sections of a video with a sequence of encrypt keys and generating a plurality of sequences of decrypt keys of varying perfection are provided. The sequencing of the decrypt keys of varying perfection is key-coded to watermark the decrypted video so that the source of pirated copies of the video may be traced. Application of the system and method for the purposes of advance screening, digital cinema distribution, video service-network content distribution including broadcast services, on-demand services and pay-per-view services are also provided.
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Citations
36 Claims
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1. A method comprising:
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encrypting each of a plurality of sections of a video with a respective encrypt key from a sequence of encrypt keys; for each encrypt key defining a respective set of at least one decrypt key, at least some of the sets containing at least two decrypt keys of varying perfection generating a plurality of sequences of decrypt keys that correspond to the sequence of encrypt keys, each sequence comprising a respective decrypt key from each set of at least one decrypt key, the keys from sets containing at least two decrypt keys being selected to encode information specific to that sequence of decrypt keys. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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an encryptor for encrypting each of a plurality of sections of a video with a respective encrypt key from a sequence of encrypt keys, for each encrypt key there being defined a respective set of at least one decrypt key, at least some of the sets containing at least two decrypt keys of varying perfection; a key set generator that generates a plurality of sequences of decrypt keys that correspond to the sequence of encrypt keys, each sequence comprising a respective decrypt key from each set of at least one decrypt key, the keys from sets containing at least two decrypt keys being selected to encode information specific to that sequence of decrypt keys.
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12. A method comprising:
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obtaining an encrypted video comprising a plurality of encrypted video sections each encrypted with a respective encrypt key from a sequence of encrypt keys; accessing an encrypt key storage to provide identification information; receiving a key-coded sequence of decrypt keys encoded with information specific to the identification information; and decrypting each encrypted video section with a respective decrypt key from the sequence of decrypt keys, thereby watermarking the decrypted video. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A video decryption system comprising:
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an encrypted video storage operable to store an encrypted video comprising a plurality of encrypted video sections each encrypted with a respective encrypt key from a sequence of encrypt keys; and a decryptor functionally connected to the encrypted video storage and operable to; access an encrypt key storage to provide identification information; receive a key-coded sequence of decrypt keys encoded with information specific to the identification information; and decrypt each encrypted video section with a respective decrypt key from the sequence of decrypt keys, thereby watermarking the decrypted video. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification