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During the days of Macrovision I worked in a large video production/post facility. Spent as much time making sure it worked for our customers as I did 'managing' it on customer playback equipment... the same ones who insisted we have it run thru Macrovision. Also making sure that it didn't kill closed captioning signals, which are on line 21/field 1 (mostly). A somewhat level-sensitive data signal nestled one line away from a deliberately wacky video signal.
Good tip on Betamax for those in need.
Have a couple no-longer-used satellite/SD TiVos, plus the ever-popular Replay TV just for good measure.
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