EP0710025A1
Expired / Lapsed
EP
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Digital signal transmitting methods, digital signal receiving apparatus, and recording media
Assignee: Sony Corp
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Filing: 1995-10-27
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Granted: —
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Expires: 2015-10-27
Abstract
Abstract A digital signal transmitting method, a digital signal receiving apparatus (40), and a recording medium (101) ensure the security of fee-charged software information. When an image providing predetermined services is transmitted, a band-compression coded digital video signal is subjected to first-encryption processing and then the digital signal is subjected to further encryption processing and transmitted. Therefore, double security can be added to the video signal and a digital signal transmitting method of more firmly ensured security can be realized.
Inventors
- 👤 Yukio c/o Int. Prop. Div. Kubota
- 👤 Koichi C/O Int. Prop. Div. Goto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:30
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/234; H04N21/2347; H04L; H04L9/00; H04L9/32; H04H; H04H60/00; H04H60/09; H04H60/14; H04H60/23; H04N21/23473; H04N21/235; H04N21/2351; H04N21/236; H04N21/23614; H04N21/40; H04N21/43; H04N21/432; H04N21/4325; H04N21/433; H04N21/4331; H04N21/4334; H04N21/434; H04N21/4348; H04N21/435; H04N21/4353; H04N21/45; H04N21/454; H04N21/80; H04N21/81; H04N21/8166; H04N7/00; H04N7/16; H04N7/167; H04N7/1675
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A digital signal transmitting method where at least a band-compression coded digital video signal is given encryption processing and transmitted, wherein when an image providing predetermined services is transmitted, said band-compression coded digital signal is given first-encryption processing and then the first-encryption processed digital signal is further given said encryption processing and transmitted.
Claim 2
Dependent Claim
47 words
The digital signal transmitting method according to claim 1, wherein said band-compression coded and first-encryption processed digital signal are mixed with a digital signal where said band-compression encoding has been completed within a predetermined image unit, and the mixed signal is given said encryption processing and transmitted.
Claim 3
Dependent Claim
34 words
The digital signal transmitting method according to claim 1, wherein a first encryption key, which is used when giving said first-encryption processing to said band-compression coded signal, is encrypted with a second encryption key.
Claim 4
Dependent Claim
50 words
A digital signal transmitting method where at least a band-compression coded digital video signal is given encryption processing and transmitted, wherein said band-compression coded and encryption processed digital signal is mixed with a digital signal where said band-compression encoding has been completed within a predetermined image unit to be transmitted.
Claim 5
Dependent Claim
98 words
A digital signal receiving apparatus for receiving at least a band-compression coded digital video signal over which a first cipher is put and then a second cipher is put and which is transmitted by a broadcasting station, comprising: second-decryption means for decrypting said second cipher put over said digital signal; recording/reproducing means for recording said digital signal, where said second cipher was decrypted, on a recording medium, and also for reproducing said digital signal recorded on said recording medium; and first-decryption means for decrypting said first cipher of a reproduction signal that is reproduced from said recording medium.
Claim 6
Dependent Claim
70 words
The digital signal receiving apparatus according to claim 5, wherein said first decrypting means includes key decryption means decrypting a cipher put over an encryption key which is used when putting said first cipher over said band-compression digital signal, and wherein a cipher, put over said encryption key, is decrypted by said key decryption means, and the first cipher of said reproduction signal is decrypted with the decrypted encryption key.
Claim 7
Dependent Claim
117 words
The digital signal receiving apparatus according to claim 5, wherein: said broadcasting station mixes said band-compression coded digital signal where the first cipher was put over and a digital signal where the band-compression encoding has been completed within a predetermined image unit, then put a second cipher over the mixed signal, and transmits it; and said recording/reproducing means records said digital signal over which the first cipher was put and also records said digital signal where the band-compression encoding has been completed at a predetermined image unit, and at the time of variable-speed reproduction, outputs a variable-speed reproduction image by means of said digital signal where the band-compression encoding has been completed at a predetermined image unit.
Claim 8
Dependent Claim
40 words
A digital signal receiving apparatus which has a modem and, by controlling, by means of said modem, switching of an access to a plurality of management stations managing billing information, constructs a billing system of said plurality of management stations.
Claim 9
Dependent Claim
17 words
A recording medium wherein at least a band-compression coded digital video signal has been encrypted and recorded.
References Cited (Backward Citations)
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