Using your same equipment that you use when you Don't get the copy protected warning . Because that TV show doesn't have broadcast flags. The quality should be the same when using the Grex.
My understanding is the input on a settop DVD recorder is 480i max.So as long as your source has at least that the quality should be the same.
You didn't post what converter you are using Cable or Satellite or the model.So I have no idea what the output is.You manual would probably be the best source.
I think unconverting the source would probably be a mistake before going through the Grex but you might want to test that.If you can upconvert I wouldn't use ove 480p for a DVD.
Just keep in mind DVD =SD(standard definition)
I haven't went to Blu-ray so I will let those that have discuss it. It is my understanding that is what you will need to use if you want to burn HD (high definition). The need or ability to do that depends on the source. At the present time Dimax the company that manufactures the Grex doesn't have a product that works with HDMI . I doubt they or any company will anytime soon. So there is no way to remove the broadcast flags & remain true HD.
I'm sure there are members here that can explain this better & I hope they will.
@Jimbo ; We were posting about the same time.I agree with you if the OP is making a backup copy of a commercial DVD.
I took this as a broadcast flag removal problem. The one time I used the Grex DVD settop to DVD settop . With a commercial DVD as the source the GREX in the middle it removed the copy protection fine. The only reason I did that was the source DVD was badly scratched & software on the computer wouldn't complete a backup.