I have had 4 copies.
I sold my DVD to CEX of it to make some room at home, that replaced a tape copy recorded from a faultly layer change DVD.
I now of course have the BluRay.
1) Original faulty DVD.
2) Copy on video tape, actually looked very good, used top end Sony VCR,and I mean really top end.
3) Replacement DVD from publishers with working layer change.
4) The Blu Ray