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Depending on where you are, asking for permission may be either just good practice (to not be an asshole) or a legal requirement. I believe it's the latter in B

• yakubin 4y ago
  It’s a legal requirement, where I am. I just know of several cases where that wasn’t done. And in the case of that Flickr account I do wonder whether the author stopped the cyclists to ask, where I’d guess he would often maybe not be able to.