Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems United States Patent 05563946

05563946 is referenced by 320 patents and cites 10 patents.

A method and apparatus is provided for transferring encrypted files from a source computer to one or more target computers. An export program is provided in the source computer and an import program is provided in the target computer. The export program decrypts the encrypted file and tags the export operation with an export counter value. The clear text file is then encrypted with an encryption operation utilizing a key which is unique to a transfer memory media, such as diskette serial number. The memory media is carried to a target computer which utilizes the import file to decrypt the encrypted file.

Title
Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems
Application Number
8/238418
Publication Number
5563946
Application Date
April 25, 1994
Publication Date
October 8, 1996
Inventor
Robert F Pryor
Longmont
CO, US
Jagdish Nagda
Boulder
CO, US
Thomas E Cooper
Louisville
CO, US
Agent
Andrew J Dillon
Barry J Bumgardner
Melvin A Hunn
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 15/21
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Citations: 320 (view full list)

  1. Karl L Ginter, Victor H Shear, W Olin Sibert, Francis J Spahn, David M Van Wie: Systems and methods for secure transaction management and electronic rights protection. InterTrust Technologies, Nixon & Vanderhye P C, April 6, 1999: US05892900 (2467 worldwide citation)
  2. Victor H Shear, David M Van Wie, Robert P Weber: Systems and methods for matching, selecting, narrowcasting, and/or classifying based on rights management and/or other information. InterTrust Technologies Corporation, Finnegan Henderson Farabow Garrett & Dunner L, August 29, 2000: US06112181 (999 worldwide citation)
  3. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie: Systems and methods for secure transaction management and electronic rights protection. InterTrust Technologies, Nixon & Vanderhye P C, June 8, 1999: US05910987 (930 worldwide citation)
  4. David M Van Wie, Robert P Weber: Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels. InterTrust Technologies, Nixon & Vanderhye P C, August 24, 1999: US05943422 (906 worldwide citation)
  5. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie, Robert P Weber: Trusted and secure techniques, systems and methods for item delivery and execution. InterTrust Technologies, Finnegan Henderson Farabow Garrett & Dunner L, February 6, 2001: US06185683 (763 worldwide citation)
  6. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie: Systems and methods for the secure transaction management and electronic rights protection. InterTrust Technologies Corporation, Finnegan Henderson Farabow Garrett & Dunner L, June 26, 2001: US06253193 (736 worldwide citation)
  7. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie: Systems and methods for secure transaction management and electronic rights protection. InterTrust Technologies, Nixon & Vanderhye P C, June 22, 1999: US05915019 (702 worldwide citation)
  8. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie: System and methods for secure transaction management and electronic rights protection. InterTrust Technologies Corporation, Nixon & Vanderhye P C, June 29, 1999: US05917912 (686 worldwide citation)
  9. Karl L Ginter, Victor H Shear, Francis J Spahn, David M Van Wie: Systems and methods for secure transaction management and electronic rights protection. InterTrust Technologies Corporation, Nixon & Vanderhye P C, September 7, 1999: US05949876 (623 worldwide citation)
  10. Edwin J Hall, Victor H Shear, Luke S Tomasello, David M Van Wie, Robert P Weber, Kim Worsencroft, Xuejun Xu: Techniques for defining using and manipulating rights management data structures. InterTrust Technologies, Finnegan Henderson Farabow Garrett & Dunner, July 6, 1999: US05920861 (578 worldwide citation)

References: 10 (view full list)

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