If you are going to store your photos in a public access web site like photobucket do not upload the original high res images, keep them low res.
Unfortunately any photos posted in the public domain are at the mercy of rip off merchants. I can't believe how many of my photos are on peoples Facebook pages, some with the watermark cropped out. But, at least they are low res versions that can not be printed bigger than 6 x 4, and not good print quality.