Protection of audio or video data in a playback device
US8256005B2 · kind B2 · utility
3Cited by
9References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2007 |
| Grant date | Aug 28, 2012 |
| Priority date | — |
| Expiry date | Jul 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus to prevent hacking of encrypted audio or video content during playback. Hackers, using a debugging attachment or other tools, can illicitly access encrypted data in memory in a playback device when the data is decrypted during playback and momentarily stored in digital form. This hacking is defeated here by methodically “poisoning” the encrypted data so that it is no longer playable by a standard decoder. The poisoning involves deliberate alteration of certain bit values. On playback, the player invokes a special secure routine that provides correction of the poisoned bit values, for successful playback.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.