2) content that you can document has been put into public domain (the owner explicitly and in writing surrenders copyright to the public domain);
Actually you are supposed to :
1) have a written permission made out to YOURSELF from the original owner or...
2) Be able to produce a copy of a publically displayed document stating to the effect that it was released to PD AND be able to provide evidence that it WAS the right person that posted it. (THAT could be real hard to prove)
The ONLY legal PD that you can use without license is any photo taken By someone in the employ of the US Govt. Whether military or whatever.
But that I believe is only legal for US citizens to do.
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