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System and method for data recovery |
Steven B. Lipner, David M. Balenson, Carl M. Ellison |
1999-11-23 |
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1999-09-21 |
| 5745573 |
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1997-06-17 |
| 5557346 |
System and method for key escrow encryption |
Steven B. Lipner, David M. Balenson, Carl M. Ellison |
1996-09-17 |
| 5557765 |
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1996-09-17 |
| 5361359 |
System and method for controlling the use of a computer |
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1994-11-01 |
| 4962533 |
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