Thanks Ebby. Unfortunately the public libraries here only permit you to renew books, not music CDs or DVDs. VHS tapes can be renewed but not DVDs. Go figure.
As to making copies of the DVD, I do not have a DVD burner and so cannot burn a copy, which is why the question of viewing the DMG directly came up.
Anyway, it is now a moot point because I just returned the DVD, did not have time to watch it.