Legally speaking, if you are doing something in a public display, then by law you can be photographed without having to sign anything. Keep in mind that there's "public place" and "public property" - a shopping mall is a public place, but it is private property - the public is welcome if they obey the rules established by the property owner. Generally, the person that does the photographing can then do whatever they want with the footage, even sell it- it's theirs, taken publicly, depicting willing participants. GENERALLY. It's possible that if someone tried to sell this (especially - but not limited to - on an adult themed web site) that the sale could be legally challenged, but whether the challenge would be successful is by no means guaranteed. The age factor could come into play if the persons depicted were underage - parents didn't agree to the sale, as agents on the child's behalf, the adult website is selling videos with underage kids, etc., but still, it would be a challenge, not a slam dunk. Making the whole thing more difficult is that within the context of the renfair, the stocks & tickling is completely relevant to the context. In other words, it's not like a fetish guy went to a public park and set up tickling stocks with the express purpose of videotaping ticklees to sell later. I'd be really uncomfortable if a 16 year old friend or family member was depicted on one of these tapes being sold to fetishists, but the irony/hipocracy of myself is that I don't really care all that much if it was a total stranger. Eh, whatta ya gonna do....