Most of the legal questions I see posted have to do with either copyright, or the right to shoot in public. This one is different. A few years back I was planning a trip to Washington DC and I wanted to shoot some shots I'd been jonesing for for a while, in one of the museums. I called to get information in advance since I wanted to shoot large format and therefore needed to use a tripod. The first thing that surprised me was that they asked me whether I intended to sell the photos. I was surprised because I had been told by a Park Ranger that any photo taken on or off federal land that is intended for public use is mine to do with as I please, including selling for a profit. This is how everybody can take pics of, say, El Capitan, and potentially make money from them if they're any good. Since this was one of the art museums I asked if they were afraid that I was going to photograph the art, but that wasn't the issue. They wanted to prevent me from selling images of the buildings, inside or out. And it's the out part that really surprised me. They claim to be able to control what is done with images of the building itself, including images from the sidewalk, the Mall, the street, you name it, as well as images shot inside the building. If anybody knows about the law in regard to this, I'd love to be informed.