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EP0665486A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of protecting electronically published materials using cryptographic protocols

Assignee: AT&T Inc
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Filing: 1995-01-18
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Granted: —
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Expires: 2015-01-18
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Abstract

Abstract The present invention is a method of protecting electronically published documents. It involves operating a computer system and network (9) for electronic publication of documents, including the steps of: a) receiving requests for documents from a plurality of users (117) having computers with display devices (121) or printers (123), including with the requests unique user identification for each of the plurality of users; b) authenticating the requests from the plurality of users with a copyright server (7); c) using the copyright server to direct a document server (3) to act upon proper authentication of each request; d) in response to direction from the copyright server, using a document server (7) to create uniquely encoded, compressed and encrypted documents for each authenticated request, the documents having unique encoding corresponding to each of the plurality of users, and forwarding the documents to each authenticated request user through the network (9) to corresponding agents of each authenticated request user, each of the agents being selected from display agents (111) and printer agents (113); and, e) decrypting and uncompressing the documents at each of the agents and making the documents available for use only in response to receiving correct secret keys provided by the authenticated request user to the agents. These agents are either pre-installed as software into each of the plurality of users' computers, pre-installed as hardware or firmware into user hardware selected from display devices and printers, or are software programs transmitted at the time of use.

Inventors

  • 👤 Abhijit K. Choudhury
  • 👤 Nicholas F. Maxemchuk
  • 👤 Paul Sanjoy
  • 👤 Henning G. Schulzrinne

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 16:40
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/10; G06F21/16; G06F21/60; G06F21/606; G06F21/608; G06F21/62; G06F21/6209

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 207 words
A method of protecting electronically published documents, which comprises: operating a computer system and network for electronic publication of documents, and including therein the steps of: a.) receiving requests for documents from a plurality of users having computers with display devices or printers, said computers being connected by said network to said computer system, said requests including unique user identification for each of said plurality of users; b.) authenticating said requests from said plurality of users with a copyright server; c.) using said copyright server to direct a document server to act upon proper authentication of each request; d.) in response to direction from said copyright server, using a document server to create encrypted documents along with a unique identification for each authenticated request and forwarding said documents to each authenticated request user through said network to corresponding agents of each authenticated request user, each of said agents being selected from display agents and printer agents; e.) encoding said documents so that each document created is uniquely encoded based upon said unique identification; and, f.) decrypting said documents at each of said agents and making said documents available for use only in response to receiving correct secret keys provided by said authenticated request user to said agents.
Claim 2
Dependent Claim 33 words
The method of claim 1 wherein said document server also compresses said documents and said agents uncompress said documents in response to receiving a correct secret key provided by said authenticated request user.
Claim 3
Dependent Claim 41 words
The method of claim 1 wherein said plurality of users have the same agents that uses an algorithm that derives a key from a system identifier to allow decryption and display in subsequent response to a unique, correct user secret key.
Claim 4
Dependent Claim 32 words
The method of claim 1 wherein said plurality of users receive agents with each document forwarded, all such agents being the same for a given document and different from publication to publication.
Claim 5
Dependent Claim 24 words
The method of claim 1 wherein said plurality of users receive agents with each document forwarded, all such agents being different from one another.
Claim 6
Independent Claim 211 words
A method of protecting electronically published documents, which comprises: operating a computer system and network for electronic publication of documents and including therein, the steps of: (a) receiving requests for documents from a plurality of users having computers with display devices or printers, said computers being connected by said network to said computer system, said requests including unique user identification for each of said plurality of users; (b) authenticating said requests from said plurality of users with a copyright server; (c) using said copyright server to direct a document server to act upon proper authentication of each request; (d) in response to direction from said copyright server, using a document server to create compressed and encrypted documents for each authenticated request, and forwarding said documents to each authenticated request user through said network to corresponding agents of each authenticated request user, each of said agents being selected from display agents and printer agents; (e) encoding said documents so that each document created is uniquely encoded with encoding corresponding to each of said plurality of users; and, (f) decrypting and uncompressing said documents at each of said agents and making said documents available for use only in response to receiving correct secret keys provided by said authenticated request user to said agents.
Claim 7
Dependent Claim 22 words
The method of claim 1 or 6 wherein said agents are pre-installed as software into each of said plurality of users' computers.
Claim 8
Dependent Claim 27 words
The method of claim 1 or 6 wherein said agents are software programs which are transmitted to said plurality of users only after requests have been authenticated.
Claim 9
Dependent Claim 28 words
The method of claim 1 or 6 wherein said agents are pre-installed as computerware selected from hardware and firmware, into user hardware selected from display devices and printers.
Claim 10
Dependent Claim 21 words
The method of claim 1 or 6 wherein each of said agents has a unique internal code corresponding to its user.
Claim 11
Dependent Claim 27 words
The method of claim 1, 6, 7 or 9 wherein each of said agents is capable of decrypting only a single, uniquely encoded version of documents published.
Claim 12
Dependent Claim 40 words
The method of claim 6 wherein said agents are pre-installed as firmware into user hardware selected from display devices and printers, and wherein each of said agents is capable of decrypting only a single, uniquely encoded version of documents published.
Claim 13
Dependent Claim 17 words
The method of claim 1 or 6 wherein said documents are uniquely encoded by the document server.
Claim 14
Dependent Claim 21 words
The method of claim 1 or 6 wherein said documents are uniquely encoded after being forwarded to each authenticated request user.

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