The Chinese subtitles for silence use a common mark for pirated media in that language, according to other commentors here. In general it's pretty likely that if you're finding non professional subtitles they were distributed with pirated media in some form, that's where you get the most fan subs after all
> were distributed with pirated media in some form,
I disagree with this conclusion. I've used e.g. the opensubtitles dataset for some data-analysis in the past. It's a huge dataset, freely available and precisely intended for such use. Now, if all the data in the opensubtitles dataset is legal, is another point.
So one might argue that using this opensubtitles dataset, makes one complicit to the illegal activities of opensubtitles themselves, IDK: IANAL.
