Software protection system
Patent 4471163 Issued on September 11, 1984. Estimated Expiration Date: 
October 5, 2001. 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.
October 5, 2001. 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 References 3566362 Operating system authenticator Computer software security system Crypto microprocessor for executing enciphered programs Method of filtering oil from oil-and-water emulsions Patent #: 4309289 InventorsApplicationNo. 06/308248 filed on 10/05/1981US Classes:705/55, Requiring a supplemental attachment or input (e.g., dongle) to open705/59LicensingExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmInternational ClassG06F 21/00 (20060101)AbstractA protection system for controlling the operation of a digital computer as to a particular program wherein a program "lock" interfaces with the computer and authorizes the operation in response only to a selected relation between a number in the program, a number in the lock, and a third number, a "key", supplied to the lock and which bears a selected relation to both the program number and lock number.Other References
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