How did descrambling cable channels in the 90s work?
Back then the way scrambling worked was they just didn't send the sync pulse (the mark for the start of the frame). The cable box then had a circuit that when authorized made a sync pulse and inserted it back in. The descramblers were boxes that just added in sync pulse to make it watchable. https://scrabblewordfinder.vip/ https://www.applock.ooo/ https://www.7zip.vip/
This also worked for the video on satellite channels scrambled with VideoCipher II. The audio on those channels was a different thing, though. VC II audio was actually encrypted with DES encryption, which was almost unbreakable at the time.
Because it was in analog signal, there was audio and video carried separately,
if replace position no one can watch without to return in right place.
Also if between video and audio have static noise,
picture and audio was destroyed (used by HBO but hacked easily)