Interactive Video Distribution Systems Patents (Class 725)
- By mechanical lock (Class 725/26)
- Of specific channel (Class 725/27)
- Of specific program (e.g., based on program rating) (Class 725/28)
- Time dependent (e.g., time spent viewing program, time of day, etc.) (Class 725/29)
- Access via PIN or password (Class 725/30)
- With encryption or scrambling of video signal (Class 725/31)
- Telephony via television distribution network (Class 725/106)
- Remote testing of cable system (Class 725/107)
- Alarm system using television network (Class 725/108)
- Having link to external network (e.g., interconnected computer network) (Class 725/109)
- Server or headend (Class 725/114)
- Transmission network (Class 725/118)
- Receiver (e.g., set-top box) (Class 725/131)
