[hunter2_]

If the rolling cypher they implemented truly exceeds DASH in such a way as to exert control, then I think that would convey intent. If it's substantially DASH alone and DASH requires the equivalent of a rolling cypher just to work, that's rather meaningless; the intent of implementing DASH certainly would've had most to do with adaptive bitrate UX.

Based on some other comments, it sounds like they added something like this for music videos and the like, so it may hold up.

But I'm armchair judging at this point, and IANAJ.

Isn't a rolling code how RF locks (car fob, garage opener, etc.) operate? Those are actually good at keeping out third parties, though.