Additional Data Controlling Recording Or Playback Operation Patents (Class 386/248)
- Having code table (e.g., CGMS, etc.) (Class 386/253)
- Degrade/modify part of the video signal levels (e.g., back or front porch color burst, etc.) (Class 386/254)
- With spread spectrum (e.g., PN sequence, etc.) (Class 386/256)
- Diverse video copy protection (Class 386/257)
- Video scrambler (Class 386/258)
- Video encryption (Class 386/259)
- Video watermarking (Class 386/260)