I am not sure whether this has been discussed anywhere; if so, please point me to the right place. Still it shouldn't hurt to discuss it anyway.
With the site growing there will be an increasing need for including images into answers (I find they help a huge deal in certain cases; one picture is worth a 103 words, etc.). But what about copyright issues? I guess most of the authors (if they can be find, that is) wouldn't mind but it would still be correct to ask them, right (and not just because they might sue you)? On the other hand, it seems strange not to post an answer while waiting for a response from the author.
So, is there any policy about these things? Or is it perhaps no big deal, with issues being solved a posteriori after author finds his copyright is being infringed?