| System & Type Of Scrambling Used |
Scrambling Method Used |
Security Level |
| COMSAT SATGUARD |
Dupresses horizontal synch, audio combined with complex digital 15.734-khz waveform |
Moderately High Video And Audio |
| Analog Audio |
Video Line Inversion, Individual Lines Specifically |
|
| Analog Video [SATELLITE] |
|
|
| TELEASE |
Sine wave (94 khz) aded to video; audio is modulated on 15.6 khz (approximately) subcarrier |
Moderate |
| Analog Audio |
|
|
| Analog Video [SATELLITE] |
|
|
| OAK SYSTEMS |
Video may be inverted; synch missing |
Audio High |
| 1. Oak Orion |
Color burst moved to nonstandard location; random video polarity sequences |
Moderate Video |
| Digital Audio |
Audio is digital, with data pulses in the horizontal blanking interval; audio may be further encrypted |
|
| Analog Video [SATELLITE] |
|
|
| 2. Oak Polaris |
Video lines shuffled, DES encrypted |
Very High Audio |
| |
Audio in horizontal blanking interval digital, DES encrypted |
Very High Video |
| Digital Audio |
|
|
| Digital Video [SATELLITE] |
|
|
| 3. Oak (Sine wave)[CABLE] |
Video modulated with 15.7 khz or 31.5 khz sine wave; audio on 62.5 khz subcarrier |
Low to Moderate Video |
| Analog Audio |
|
|
| Analog Video |
|
|
| 4. Oak SIGMA[CABLE] |
Video randomly inverted on scene changes Synch omitted; vertical and horizontal synch intervals have digitized encrypted audio |
Very High Audio |
| Analog Video |
Decryption keys on seperate carrier [CABLE] |
|
| Digital Audio |
|
|
| GI STAR-LOK |
Synch and color burst are removed and scanning lines diced and rotated according to DES algorithm |
Very High Video |
| Digital Video |
Audio is digital and DES encrypted |
|
| Digital Audio [SATELLITE] |
|
|
| MA-COM LINKABIT, INC |
Video lines diced in variable size segments and DES encrypted |
Very High Video |
| |
|
Very High Audio |
| 1. VideoCipher I |
Audio is digital and DES encrypted |
|
| Digital Video |
|
|
| Digital Audio [SATELLITE] |
|
|
| 2. VideoCipher II |
Video inverted synch removed; color burst relocated |
Moderate Video |
| Analog Video |
Audio is digital in the horizontal blanking intervals and DES encrypted |
Very High Audio |
| Digital Audio [SATELLITE] |
|
|
| JERROLD STARCOM |
Synch suppression pseudo random (6-10 db); audio clear |
Low to Moderate Video |
| |
|
Audio Clear |
| 1. Analog Video [CABLE] |
|
|
| TOCOM |
Video randomly inverted; random synch supression and video may be compressed |
Low to Moderate Video |
| Analog Video |
Audio Clear |
Audio Clear |
| Clear Audio [CABLE] |
|
|
| ZENITH |
Video randomly inverted. Audio on subcarrier is synch suppressed |
Moderate Video |
| SSAVI, z TAC |
|
|
| Analog Audio |
|
|
| Analog Video [CABLE](Over-The-Air) |
|
|
| HAMLIN |
Random synch supression similar to SSAVI |
Moderate Video And Audio |
| Analog Video |
|
|
| Analog Audio [CABLE] |
|
|
| SCIENTIFIC ATLANTA B-MAC |
Video time compressed, luminance and chroma sent seperately |
High Video |
| |
|
High Audio |
| |
Synch and data sent in random-width packets of digitized audio |
|
| Digital Video |
|
|
| Digital Audio [SATELLITE] |
Non-NTSC format |
High Audio |
| SINE WAVE |
Video has interfering sine wave superimposed. Audio is on a 15 khz subcarrier |
Moderately Low Video And Audio |
| Analog, From Various Manufacturers |
|
|
| Cable, Over-The-Air UHF |
|
|
| GATED SYNCH |
Synch pulses suppressed by fixed amount |
Low Video And Audio |
| |
|
Decoder Is Simple To Build |
| Analog, From Various Manufacturers |
|
Cable, Over-The-Air UHF |
| OUTBAND |
Synch pulses on seperate video carrier that is usually in FM broadcast band |
Low Video |
| |
|
No Audio |
| [CABLE] |
Audio May Be In Clear |
Decoder Is Simple To Build |
| Analog Video And Audio |
Main program video has synch pulses removed |
|
| Various Manufacturers [CABLE] |
|
|
| "NASA" SYSTEM |
Horizontal lines shifted in groups |
Moderate Video |
| |
Video polarity inverted in various lines |
No audio unless encrypted |
| Analog Video [SATELLITE] |
Audio may or may not be encrypted |
|
