One easy way to mark the authenticity of your photos is by adding watermarks containing a signature, the copyright or your logo design. Watermark Factory will assist you in adding the created watermarks to your photos and validating the images with just a few clicks.
This application will allow you to batch edit your photos by adjusting their dimensions, adding photo frames and modifying the opacity level. Personally, I would've preferred to get access to more effects that could help me improve the visual quality of my images. More to that, the offered photo frames were a bit tacky for my taste.
On the other hand, you will be able to make various watermark configurations, like setting transparency level, choosing the proper text options, adjusting position and angle. The created profile containing these adjustments can be subsequently saved and used later on.
Another good thing about Watermark Factory was that it allowed me to save the authenticated photos to varied image formats, such as JPG, GIF, PNG, BMP and TGA.
My guess is that if you don't require advanced editing tools to prepare the photos for the authenticating process, Watermark Factory would prove to be of good use when adding watermarks to your photo collections.