Patent EP0428252A2 successfully refreshed from Google Patents.
EP0428252A2
Expired / Lapsed
EP
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A system for controlling access to broadcast transmissions
Assignee: News Datacom Ltd
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Filing: 1990-09-17
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Granted: —
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Expires: 2010-09-17
Abstract
Abstract A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast and a plurality of selectable and portable executing apparatus each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by the associated receiving decoder to enable the receiving decoder to descramble the broadcast.
Inventors
- 👤 Michael Cohen
- 👤 Jonathan Hashkes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 22:02
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G06; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06Q20/38; G06Q20/40; G06Q20/409; G06Q20/4097; G06Q20/40975; H; H04; H04H; H04H60/00; H04H60/09; H04H60/14; H04H60/15; H04H60/23; H04N; H04N21/00; H04N21/40; H04N21/41; H04N21/418; H04N21/4181; H04N7/00; H04N7/16; H04N7/162; H04N7/163; H04N7/167; H04N7/1675
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
89 words
A system for controlling access to broadcast transmissions comprising: a transmitter having a transmission encoder for scrambling a broadcast; and a multiplicity of subscriber receivers, each comprising: an identical receiving decoder, containing no secret cryptographic keys, for descrambling said broadcast; and a plurality of selectable and portable executing means each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by said associated receiving decoder to enable said receiving decoder to descramble said broadcast.
Claim 2
Independent Claim
89 words
A system for controlling access to broadcast transmissions comprising: a transmitter having a transmission encoder for scrambling a broadcast; and a multiplicity of subscriber receivers, each comprising: an identical receiving decoder, containing no secret cryptographic keys, for descrambling said broadcast; and a plurality of selectable and portable executing means each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by said associated receiving decoder to enable said receiving decoder to descramble said broadcast.
Claim 3
Dependent Claim
18 words
A system as in claim 1 and wherein said executing means includes means for actively executing an algorithm.
Claim 4
Dependent Claim
25 words
A system as in claim 1 and wherein said executing means includes means for providing instructions and data for an algorithm executed in said decoder.
Claim 5
Dependent Claim
22 words
A system as in claim 1 and wherein said executing means includes means for providing all instructions required to descramble said transmission.
Claim 6
Dependent Claim
24 words
A system as in claim 1 and wherein said executing means includes means for providing a portion of instructions required to descramble said transmission.
Claim 7
Dependent Claim
22 words
A system as in claim 1 and wherein said executing means comprises means for providing proof of authenticity to said receiving decoder.
Claim 8
Dependent Claim
18 words
A system as in claim 6 and wherein said executing means comprises a public key proof of authenticity.
Claim 9
Dependent Claim
19 words
A system as in claim 6 and wherein said executing means comprises a Fiat-Shamir public key proof of authenticity.
Claim 10
Dependent Claim
22 words
A system as in claim 1 and wherein each executing means contains a separate identification element which is sensible by a decoder.
Claim 11
Dependent Claim
21 words
A system as in claim 1 and wherein each executing means comprises an element which indicates programming entitlements to said decoder.
Claim 12
Dependent Claim
26 words
A system as in claim 10 and wherein said element which indicates programming entitlements to said decoder is modified by information contained in said transmitted broadcast.
Claim 13
Dependent Claim
32 words
A system as in claim 1 and wherein said decoder comprises a mailbox for receiving data from broadcast transmissions and from a first of said plurality of selectable and portable executing means.
Claim 14
Dependent Claim
17 words
A system as in claim 12 and wherein said executing means is operative to access said mailbox.
Claim 15
Dependent Claim
44 words
A system as in claim 12 and wherein said data from broadcast transmissions and from said first of said plurality of selectable and portable executing means comprises entitlement information and activation data for enabling operation of said new apparatus removably associatable with said decoder.
Claim 16
Dependent Claim
25 words
A system as in claim 1 and wherein said executing means may contain information which can be accessed by said decoder for modifying software thereof.
Claim 17
Dependent Claim
20 words
A system as in claim 1 and wherein said executing means comprises means for generating displayed messages via said decoder.
Claim 18
Dependent Claim
31 words
A system as in claim 1 and wherein said decoder is operative to generate displayed messages originating from any of the following sources: said broadcast, said decoder and said executing means.
Claim 19
Dependent Claim
16 words
A system as in claim 16 and wherein said displayed messages may be assigned designated priorities.
Claim 20
Independent Claim
61 words
A system for transferring information comprising: a plurality of portable card means each comprising microprocessor means for generating and transmitting data to be stored; and fixed storage means for receiving said data from a first of said plurality of card means, for storing said data, and for enabling a second of said plurality of card means to remove said data therefrom.
Claim 21
Independent Claim
61 words
A system for transferring information comprising: a plurality of portable card means each comprising microprocessor means for generating and transmitting data to be stored; and fixed storage means for receiving said data from a first of said plurality of card means, for storing said data, and for enabling a second of said plurality of card means to remove said data therefrom.
Claim 22
Independent Claim
98 words
A system for transferring information comprising: computing means for generating and transmitting a first set of data to be stored; a plurality of portable card means each comprising microprocessor means for generating and transmitting a second set of data to be stored; and fixed storage means for receiving at least one of said first and second data from said computing means and a first of said plurality of card means, for storing said information, and for enabling a second of said plurality of card means to remove said at least one of said first and second data therefrom.
Claim 23
Independent Claim
98 words
A system for transferring information comprising: computing means for generating and transmitting a first set of data to be stored; a plurality of portable card means each comprising microprocessor means for generating and transmitting a second set of data to be stored; and fixed storage means for receiving at least one of said first and second data from said computing means and a first of said plurality of card means, for storing said information, and for enabling a second of said plurality of card means to remove said at least one of said first and second data therefrom.
References Cited (Backward Citations)
No citation records indexed.
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