专利汇可以提供Software protection and identification system专利检索,专利查询,专利分析的服务。并且5A method of protecting machine readable signals recorded on magnetic recording media from unauthorized duplication and use. The signals to be protected are recorded on an authorized magnetic recording medium having a relatively high coercivity. An attempt is made by the computer to alter predetermined validating signals on a recording medium presented for use in the computer. The computer is disabled from further using the signals recorded on the recording medium if the validating signals cannot be read back. If the protected signals have been copied onto an unauthorized recording medium having a relatively lower coercivity and such unauthorized recording medium is presented to the computer, the validating signals will be alterable. Thus, an unauthorized copy of the protected signals cannot be used since the system detects that the validating signals have been changed and disables the system.,下面是Software protection and identification system专利的具体信息内容。
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