Encrypted data signal, data storage medium, data signal playback apparatus, and data signal recording apparatus
First Claim
1. An encrypted data signal encrypting a copy-controlled data signal, wherein the data signal contains superimposed thereto as a digital watermark identification data identifying the data signal as an encrypted signal.
1 Assignment
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Accused Products
Abstract
Playing a data signal from an illegally produced data storage medium can be effectively disabled regardless of the type of storage medium so that copying can be prevented effectively at low cost. An encrypted data signal encrypting a copy-controlled data signal has superimposed thereto as a digital watermark identification data identifying the data signal as an encrypted signal. A data storage medium records this encrypted data signal, a data signal player reproduces the signal, and a data signal recorder records the signal.
141 Citations
20 Claims
- 1. An encrypted data signal encrypting a copy-controlled data signal, wherein the data signal contains superimposed thereto as a digital watermark identification data identifying the data signal as an encrypted signal.
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13. A data signal recording apparatus for recording a copy-controlled data signal to a data storage medium, comprising:
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a digital watermark processor for superimposing to the data signal as a digital watermark identification data identifying the data signal as an encrypted signal;
an encryption unit for generating an encrypted data signal by encrypting the data signal to which the digital watermark processor superimposed a digital watermark; and
a writer for writing the encrypted data signal generated by the encryption unit to the data storage medium.
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Specification