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Timed availability of secured content provisioned on a storage medium

  • US 5,857,020 A
  • Filed: 12/04/1995
  • Issued: 01/05/1999
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Term
First Claim
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1. A method of controlling access by a user to a data content of a storage medium, the data being encrypted, comprising the steps of:

  • examining an at least three element authorization record which comprises the elements of an unencrypted start time prior to which decryption is inhibited, a decryption key and one of an expiration time or a usage limit, wherein the elements define access restrictions;

    measuring time; and

    enabling, responsive to the examination of the access restrictions, the decryption of the encrypted data whereby the user has access to the data.

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  • 6 Assignments
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