The background is not a problem, even if derived from the same picture as the drops. The potential problem is the "copy" of the picture in the drops. Your question got me curious, so I went looking for what guidance I could find. The clearest I found was this:http://wiki.lawguru.com/index.php/Derivative_work---------+---------+---------+---------+Joseph KSeattle, WA, USAD700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II, 50mm f/1.4 D,17-55mm f/2.8 DX, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX
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