Video Cryptography Patents (Class 380/200)
- Interactive TV (Class 380/211)
- Plural video stream multiplexing (Class 380/212)
- Chrominance scrambling (Class 380/213)
- Nonstandard scan pattern of video information (Class 380/214)
- Image data converted to digital before modification (Class 380/216)
- Variable time delay modulation of baseband video signal (Class 380/218)
- Carrier phase shift (Class 380/219)
- Carrier frequency conversion (Class 380/220)
- By modifying synchronizing signal (Class 380/221)
- Record or coin controlled (Class 380/227)
- Usage or charge determination (Class 380/231)
- Phase inversion of scan line information (Class 380/235)
- Modifying accompanying audio signal (Class 380/236)
- Encrypted code control signal (Class 380/239)
- Including addressed decoder control signal (Class 380/240)