 For example, if one were to run a video signal through a VCR before the television, some VCRs will output a ruined signal regardless of whether it is recording.This also occurs in some TV-VCR combo sets.Apart from this, many DVD recorders mistake the mechanical instability of worn videotapes for Macrovision signals, and so refuse to make what would be perfectly legal DVD dubs of legitimate video tapes, such as home movies.