Method and apparatus for providing security for computer software
Patent 4446519 Issued on May 1, 1984. Estimated Expiration Date: 
May 26, 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.
May 26, 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 ReferencesMethod and apparatus for controlling usage of a programmable computing machine Patent #: 4246638 InventorAssigneeApplicationNo. 06/266724 filed on 05/26/1981US Classes:711/164With password or keyExaminersPrimary: Zache, Raulfe B.Attorney, Agent or FirmInternational ClassG06F 21/00 (20060101)AbstractSecurity for computer software is achieved by providing each purchaser of a software package with an electronic security device which must be operatively connected to the purchaser's computer. The software sends coded interrogation signals to the electronic security device which processes the interrogation signals and transmits coded response signals to the software. The program will not be executed unless the software recognizes the response signals according to preselected security criteria. | |
