Have not seen any recent posts about photo theft etc.. but there are some useful programs to protect your photos
Visual Water Mark - its not free but for 20 dollars you can install it on 1 PC, top price is 40 and you can install it on 10 pc's and get a few more fonts and template
http://www.visualwatermark.com/
Add WaterMark - for Android - FREE! works on phones & Android tablets...
I am sure there are some for Iphone's (have not looked as I do not use Apple products) but protect your images..