Would like to hear your views if I have a case.
I did a voluntary event shoot for a dog show with some agreements. Of which is they may sell CD with my photos as long as the photos carry my watermark and no editing is allowed by its member. If any of their member wants to use the photos for promoting their kennel or advertising or for commercial use, they must pay photo royalties. (The royalties mainly goes to animal shelter and for future dog show funds)
Now I stumble upon one of kennel using and a photo I took with my watermark cropped off. They now claim the photos are theirs since they pay for the CD. The watermark was placed initially to let people know I hold the rights.