There was, actually, a rolling flap for awhile, in the early '00s, about fans using other fans' vids without permission - specifically, vidders ripping their clips from other vids instead of from original source - about evenly split between "OMG UNETHICAL", "WTF, it's the same footage either way," and "as long as you transform the clips enough - i.e. aren't re-using whole sequences in the same order - it's fine - but if you do that you're a plaugiaraist."
I haven't heard anything about it lately, probably because original source is so much easier to get that it's pretty pointless to "steal clips" (at the time, source was often only available on VHS, so unless you had the knowhow and equipment to rip from VHS, or the connections to get someone to do it for you, other vids were often the easiest place to get source). On the other hand, IIRC, some people *were* borrowing and repurposing entire sequences from other vids, not just re-ripping clips, which is slightly different (and interesting in a transformative way.)
(I know, I've wandered afield from podfic, but now I'm sort of fascinated by the idea of fanvid remixing.)
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I haven't heard anything about it lately, probably because original source is so much easier to get that it's pretty pointless to "steal clips" (at the time, source was often only available on VHS, so unless you had the knowhow and equipment to rip from VHS, or the connections to get someone to do it for you, other vids were often the easiest place to get source). On the other hand, IIRC, some people *were* borrowing and repurposing entire sequences from other vids, not just re-ripping clips, which is slightly different (and interesting in a transformative way.)
(I know, I've wandered afield from podfic, but now I'm sort of fascinated by the idea of fanvid remixing.)