Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4683968 | System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules | Matthew A. Appelbaum, David Lehman, Donald J. Nieglos, Michael Oehler | 1987-08-04 |