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| August 13, 1999 |
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| December 20, 2000 |
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| February 4, 1999 |
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| November 16, 1998 |
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| May 2, 2000 |
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| May 5, 1999 |
| 6438233 | Book data service system with data delivery by broadcasting
| August 4, 1997 |
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| December 4, 1998 |
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| August 18, 1998 |
| 6421445 | Apparatus and methods for including codes in audio signals
| June 8, 1998 |
| 6408073 | Scramble circuit to protect data in a read only memory
| January 13, 1999 |
| 6393126 | System and methods for generating trusted and authenticatable time stamps for electronic documents
| February 22, 2000 |
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| May 3, 2000 |
| 6381332 | Cable television setback decoder automatic control
| June 27, 2000 |
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| August 15, 1997 |
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| October 27, 1999 |
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| January 19, 2000 |
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| February 24, 1999 |
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| January 26, 1999 |
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| July 27, 1998 |
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| July 31, 1998 |
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| January 27, 1998 |
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| December 7, 1998 |
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| June 27, 1997 |
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| August 27, 1996 |
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| August 20, 1996 |
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| June 18, 1996 |
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| February 8, 1995 |
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| October 29, 1996 |
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| December 27, 1996 |
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| August 20, 1997 |
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| September 4, 1996 |
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| August 13, 1996 |
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| December 18, 1996 |
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| February 23, 1996 |
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| 5748732 | Pay TV method and device which comprise master and slave decoders
| February 8, 1996 |
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| July 3, 1995 |
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