This is a public domain copy of M made available through the Internet Movie Database, so if you don't want to spring for the two-disc Criterion Collection set and can't wait for it to arrive from Netflix, you can at least see it here legally.
I myself worked off the Criterion copy when I was writing my essays about Fritz Lang (here and here) and Peter Lorre (here) which explains why my quotes don't track with the subtitles you'll see in this print.
June. It's a Wrap
1 hour ago