We have many photos and limit reproductions to a specific number and charge incidental fees for paper, etc. However we encountered a problem with a local author that used our photos for a for profit book. Neither he nor we had the copyright for those particular pictures and we were told they were for incidental, not for profit use. We were dismayed and disappointed when the historical book came out with our pictures but so far no legal problems. It is a gray area so get signed policy copies to cover the pictures that go out, just in case! These pics were from a local history buff that had published several books which were copyrighted. He had passed away and the heirs probably still have the rights but again, so far, no legal problems. We did learn a valuable lesson however. The advice of a good copyright attorney is a good investment and can usually be had probono for a civic museum.