I've always wondered about the ethics of shooting outdoor photography (landscapes especially), and now that I have a DSLR, I'm really interested in the subject. Right now the practice I'm following is pretty simple: I try not to shoot from any location that's clearly private property, and of course if there's a "No Photography" sign posted (don't know if I've seen one of those, but I guess the exist?) I'd comply. Obviously all I'm doing right now is not trespassing on private property; is there anything else I need to know? Is making private property the subject of a photo OK, if it's taken from a place I'm allowed to be? And if it is OK, does the fact that the subject of the photo is someone else's property disqualify the photo for commercial use (not that it's an issue for me now, but I'd still like to know)? Sorry, this may be a dumb question, but I really am a little baffled by the subject. Thanks!