I'm not so sure this is entirely correct. I've heard about a German distributer (big one, though not major player ... I'll leave their name out since I don't like being sued if I get a tiny detail wrong) who put a trailer DVD into some of their releases and then had to pull it back because they used trailers they didn't have the rights to...
I'm not exactly sure how everything went, since that happened at the beginning of the DVD age,
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