Macrovision and Vertical Retrace Lines

[Kiwick]

I'm having a similar problem...

I'm using a 1988 JVC VCR as a modulator to watch DVDs on my 1976 Philips color set...

I don't see any retrace lines, but the brightness level is "breathing", could it be due to the "M word" ?

Is there a way to fix this problem other than purchasing illegal boxes? (like using a stand alone modulator instead of a VCR, or another kind of VCR, or some other hack)