Method and device for protecting software delivered to a user by a supplier
February 5, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesIdentification system safeguarded against misuse Computer software security system Microprocessor for executing enciphered programs Portable data carrier including a microprocessor Crypto microprocessor for executing enciphered programs Key management for encryption/decryption systems Method and means for securing the distribution of encoding keys Digital computer having code conversion apparatus for an encrypted program Crypto microprocessor using block cipher Cryptographic decoder for computer programs InventorAssigneeApplicationNo. 06/828080 filed on 02/05/1986US Classes:705/55, Requiring a supplemental attachment or input (e.g., dongle) to open235/376, Operations analysis235/382, Permitting access713/190Computer instruction/address encryptionExaminersPrimary: Shaw, Gareth D.Assistant: Kriess, Kevin A. Attorney, Agent or FirmInternational ClassesG06F 21/00 (20060101)G07F 7/10 (20060101) Foreign Application Priority Data1982-03-18 FRAbstractThe invention relates to a method and a device for protecting software delivered to a user by a supplier. The method amounts to rendering the programs non-executable in the state in which they have been delivered to the users. With each program (Pi) there is associated a validation key defined via a main validation key (Vi) delivered by the supplier and recorded in a storage area (M) of the user's machine (1), and via a supplementary key (V'i) computed on the lever of a card (C) issued to the user via a secret code (S) and via arguments (bi) that identify each program (Pi) and are recorded in a storage area (M1) of the card (C).Other References
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