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2. 发明授权

US5099516A Digital computer code word identification system 失效
标题翻译：数字电脑代码字识别系统
公开(公告)号：US5099516A
公开(公告)日：1992-03-24
申请号：US365334
申请日：1989-06-12
申请人： Michael D. Durkin , Greg N. Stewart
发明人： Michael D. Durkin , Greg N. Stewart
IPC分类号： G06F11/00 , G06F21/00
CPC分类号： G06F21/76 , G06F11/006
摘要： A digital computer system has a central processor unit (CPU). A computer program, entered into the digital computer system for execution thereof, has a program code word embedded at an arbitrary location therein. An addressable programmable array of logic (PAL) is operatively connected to the CPU for receiving a READ signal originated by the CPU at the address of the PAL, the PAL being programmed to output a portion of a preset array code word in a response to the READ signal, and to output the remainder of the array code word in segments in response to subsequent READ signals at the same address. A data bus, connected to receive and transmit the portion and remainders of the array code word to the CPU for comparison with the program code word. The program code word and the array code word are compared and, if identical permit use of the program and do not permit use when the program code word and the array code word are not identical.
摘要翻译：数字计算机系统具有中央处理器单元（CPU）。输入数字计算机系统执行的计算机程序具有嵌入在其中任意位置的程序代码字。逻辑（PAL）的可寻址可编程阵列可操作地连接到CPU，用于在PAL的地址处接收由CPU发起的READ信号，PAL被编程为输出预置阵列码字的一部分，以响应于 READ信号，并且响应于在相同地址处的后续READ信号，在段中输出阵列码字的其余部分。数据总线，被连接以接收和发送阵列码字的部分和余数到CPU，以与程序代码字进行比较。比较程序代码字和阵列代码字，如果程序代码字和阵列代码字不相同，则允许使用程序，并且不允许使用程序代码字。

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