Issued Patents All Time
Showing 51–75 of 95 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8544077 | Internet protocol telephony security architecture | Eric J. Sprunk, Alexander Medvinsky, Steven E. Anderson, Jonathan Fellows | 2013-09-24 |
| 8462954 | Content encryption using at least one content pre-key | Petr Peterka | 2013-06-11 |
| 8364964 | Registering client devices with a registration server | Alexander Medvinsky, Jiang Zhang | 2013-01-29 |
| 8255989 | Access control and key management system for streaming media | Alexander Medvinsky, Petr Peterka | 2012-08-28 |
| 8140439 | Method and apparatus for enabling digital rights management in file transfers | William L. Olson, Vida Ilderem, Frederick L. Kitson, Morris A. Moore, Petr Peterka +2 more | 2012-03-20 |
| 8068610 | Method and system for providing security within multiple set-top boxes assigned for a single customer | Scott Contini, Eric J. Sprunk, Allen James Anderson | 2011-11-29 |
| 7929701 | Multiple level public key hierarchy for performance and high security | Eric J. Sprunk | 2011-04-19 |
| 7660986 | Secure control of security mode | Xin Qiu, Eric J. Sprunk | 2010-02-09 |
| 7568223 | Internet protocol telephony security architecture | Eric J. Sprunk, Alexander Medvinsky, Steven E. Anderson, Jonathan Fellows | 2009-07-28 |
| 7404082 | System and method for providing authorized access to digital content | Alexander Medvinsky, Eric J. Sprunk, Petr Peterka | 2008-07-22 |
| 7386128 | Conditional access system providing access to multiple programs or services | — | 2008-06-10 |
| 7243366 | Key management protocol and authentication system for secure internet protocol rights management architecture | Alexander Medvinsky, Petr Peterka, Eric J. Sprunk | 2007-07-10 |
| 7058609 | Pay by time system for content delivery to media playback systems | Eric J. Sprunk | 2006-06-06 |
| 6711684 | Variable security code download for an embedded processor | Eric J. Sprunk, Adam Rappoport, Lawrence Tang | 2004-03-23 |
| 6532593 | Transcoding for consumer set-top storage application | — | 2003-03-11 |
| 6441754 | Apparatus and methods for transcoder-based adaptive quantization | Limin Wang, Ajay Luthra | 2002-08-27 |
| RE37620 | Bandwidth efficient communication of user data in digital television data stream | Ray Nuber, Chris Hoogenboom | 2002-04-02 |
| 5949795 | Processing asynchronous data within a set-top decoder | Ken Bell | 1999-09-07 |
| 5771239 | Method and apparatus for modifying a transport packet stream to provide concatenated synchronization bytes at interleaver output | Mark S. Schmidt | 1998-06-23 |
| 5754659 | Generation of cryptographic signatures using hash keys | Eric J. Sprunk, Brant Candelore | 1998-05-19 |
| 5742623 | Error detection and recovery for high rate isochronous data in MPEG-2 data streams | Ray Nuber | 1998-04-21 |
| 5703877 | Acquisition and error recovery of audio data carried in a packetized data stream | Ray Nuber, G. Kent Walker | 1997-12-30 |
| 5699124 | Bandwidth efficient communication of user data in digital television data stream | Ray Nuber, Chris Hoogenboom | 1997-12-16 |
| 5612956 | Reformatting of variable rate data for fixed rate communication | G. Kent Walker, Ray Nuber | 1997-03-18 |
| 5606616 | Cryptographic apparatus with double feedforward hash function | Eric J. Sprunk, Candace M. Anderson | 1997-02-25 |