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I had a so-called "video stabilizer" that was supposed to do that. It was probably a fraud. I never tried to copy tapes with it, but it wasnt very effective at removing the macrovision lines from the screen. It degraded color quality. I used it as a video modulator for about 6 months. Then it failed (I think). I hope you have better luck.
Copy protection on tapes is recorded on the tape. To get rid of it you have to have something to actually remove it. On DVDs, the copy protection is added on playback. It's also much brighter and more annoying to watch. Probably getting something that doesnt add it is the best solution. Certain Apex models can have it turned off, or the firmware replaced with some firmware that does not turn it on. There are some DVD recorders, too. Liteon maybe?
VHS is more trouble because it is already on the tape. They are just white pulses of varying amplitude in the first few lines of the picture. These lines are supposed to be black. The beam has not made it back up to the top of the picture during the first few lines. The white pulses show up as diagonal lines, out of convergence. There are some devices made for TV stations that replace the sync pulses, burst, and the first few black lines. These are used for trying to rescue high generation or just bad videotape. I havent tried this but it is probably expensive. Some standards converters can do this too, at about $700.
It might be possible to build something into the set to fix it. If you could keep the CRT blanked for the first few lines without affecting the rest of the picture, that might do it. I havent tried that, either.
Teletext causes the same problems, for the same reasons.
John
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