> ...it's not clear to me that traditional, non-computer law would allow the shopkeeper to retroactively characterize the visit as 'trespass'. Seems to me that

> ...it's not clear to me that traditional, non-computer law would allow the shopkeeper to retroactively characterize the visit as 'trespass'. Seems to me that something like this is more like an NDA. Assuming someone saw and understood the sign, what are the legal ramifications? And how does this compare to establishments that require membership to use such as Costco?