Those Go-Video double VCRs did have the ability to copy tapes with reduced quality loss compared to connecting the audio and video from one machine to another (or, Heaven forbid, using "Channel 3"
), but they definitely obeyed Macrovision and would not copy such tapes. That was a requirement to even keep the machines on the market; there was at least one big law suit as soon as they tried to sell their first model that they eventually settled or won.