Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-12-11
2007-12-11
Vu, Kim (Department: 2135)
Cryptography
Video cryptography
Video electric signal modification
C380S028000, C380S042000, C380S046000, C380S201000, C380S212000, C380S240000, C380S245000, C380S248000, C713S153000, C382S245000, C382S246000, C382S248000, C370S335000, C370S342000, C370S441000, C370S479000
Reexamination Certificate
active
09914371
ABSTRACT:
An apparatus for generating an encrypted data stream representing an audio and/or video signal comprises an encoder for encoding an input signal to generate a data stream with a predefined data stream syntax as output signal. The apparatus further comprises an encryption means coupled with the decoder in order to influence encoder internal data and/or the output signal of the encoder in a uniquely reversible manner based on a key such that the generated encrypted data stream comprises payload information differing from payload information of a data stream that would be generated by the apparatus without the presence of an encryption means and that the generated encrypted data stream comprises the predefined data stream syntax. Thereby, a flexible data stream encryption is achieved, wherein the degree of encryption can be freely selected such that the owner of a decoder who does not possess the key, still obtains a rough idea of the audio and/or video signal which might cause him to buy the key in order to hear or view the audio and/or video signal in its full quality. The encoder-specific encryption and decryption concept can be implemented into already existing encoders/decoders with little effort.
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Allamanche Eric
Herre Juergen
Koller Juergen
Rump Niels
Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung
Glenn Michael A.
Glenn Patent Group
To Baotran
Vu Kim
LandOfFree
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