发明授权
US4644493A Implementing a shared higher level of privilege on personal computers
for copy protection of software
失效
在个人电脑上实现共享更高级别的权限以进行软件复制保护
- 专利标题： Implementing a shared higher level of privilege on personal computers for copy protection of software
- 专利标题（中）： 在个人电脑上实现共享更高级别的权限以进行软件复制保护
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申请号： US651184申请日： 1984-09-14
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公开(公告)号： US4644493A公开(公告)日： 1987-02-17
- 发明人: Akhileshwari N. Chandra , Liam D. Comerford , Steve R. White
- 申请人： Akhileshwari N. Chandra , Liam D. Comerford , Steve R. White
- 申请人地址： NY Armonk
- 专利权人： International Business Machines Corporation
- 当前专利权人： International Business Machines Corporation
- 当前专利权人地址： NY Armonk
- 主分类号： G06F21/24
- IPC分类号： G06F21/24 ; G06F1/00 ; G06F3/06 ; G06F12/14 ; G06F21/00 ; G06F21/22 ; G06F9/00
摘要：
Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution of a program stored in a tamper proof co-processor which forms a part of the computing machine. The modified software on the original medium may then be copied, but the copy is operable only on the computing machine containing the co-processor that performed the modification.
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