Digital signal transmitting method, digital signal receiving apparatus, and recording medium
First Claim
Patent Images
1. A method for transmitting a digital signal, comprising the steps of:
- band-compression coding a first digital signal and a second digital signal, each respective digital signal defining an image;
encrypting the band-compression coded first digital signal;
multiplexing the encrypted first digital signal and the band-compression coded second digital signal; and
encrypting the multiplexed first and second digital signals to form said digital signal for transmission.
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Abstract
A digital signal transmitting method, a digital signal receiving apparatus, and a recording medium which ensure the security of fee-charged software information. When an image providing predetermined services is transmitted, a band-compression coded digital video signal is given first-encryption processing and then the digital signal is further given encryption processing and transmitted. Therefore, double security can be added to the video signal and a digital signal transmitting method where its security is more firmly ensured can be realized.
49 Citations
9 Claims
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1. A method for transmitting a digital signal, comprising the steps of:
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band-compression coding a first digital signal and a second digital signal, each respective digital signal defining an image; encrypting the band-compression coded first digital signal; multiplexing the encrypted first digital signal and the band-compression coded second digital signal; and encrypting the multiplexed first and second digital signals to form said digital signal for transmission. - View Dependent Claims (2)
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3. Apparatus for transmitting a digital signal, comprising:
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means for band-compression coding a first digital signal and a second digital signal, each respective digital signal defining an image; means for encrypting the band-compression coded first digital signal; means for multiplexing the encrypted first digital signal and the band-compression coded second digital signal; and means for encrypting the multiplexed first and second digital signals to form said digital signal for transmission. - View Dependent Claims (4)
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5. Digital signal receiving apparatus for receiving a digital video signal formed by multiplexing an encrypted first digital signal and a band-compression coded second digital signal and by encrypting the multiplexed first and second digital signals, said digital video signal encrypted with a first and second encryption key and transmitted by a broadcasting station, comprising:
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first-decryption means for decrypting said digital video signal encrypted with said first encryption key; recording/reproducing means for recording the first-decrypted digital video signal on a recording medium and for reproducing the first-decrypted digital video signal from said recording medium; and second-decryption means for decrypting the reproduced first-decrypted digital video signal encrypted with said second encryption key. - View Dependent Claims (6, 7, 8)
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9. A recording medium comprising data recorded thereon, said data defined by a digital video signal formed by multiplexing an encrypted first digital signal and a band-compression coded second digital signal and by encrypting the multiplexed first and second digital signals.
Specification