melanie, I don't want to play the "legal specialist" here (because I'm certainly not... :-), but one note: "public domain" is an established term, and it really means that everyone may do whatever he/she/it wants - if you declare it PD, you shouldn't be upset about anything, because that's what you allowed. What you more likely want to use is "Freeware" - this term includes legal restrictions (declared by you) which enables you (theoretically) to claim your rights (on a court when necessery). For that reason my tools all include a clear note that they are "Freeware, but not in the Public Domain".