Broadcasters use this technique to scramble audio and video feeds over the air or through cable networks. It prevents unauthorized hardware from decoding the transmission without the proper decryption key or subscriber hardware. Engineers implement these cryptographic protocols to secure premium content, pay-per-view events, and private satellite feeds against piracy.
Verify the civision parameters on the uplink before the pay-per-view starts, or the affiliates will just get a black screen.
Early implementations relied on simple analog sync-suppression scrambling, while newer systems use robust digital encryption algorithms tied to smart cards.
Related terms
Clean feed
An audio mix that includes all inputs except for one specific source, usually to prevent feedback.
Communications satellite
An orbital spacecraft equipped with transponders to receive, amplify, and redirect radio signals back to Earth.
BUD
A large parabolic antenna used to receive C-band satellite television transmissions.