The Internet has a unique structure compared to other media in the fact that photographs can be obtained and redistributed easily. That makes us wonder about several things, among which the most important one is - how can you know for certain your photograph won't be used without your permission?
The easiest solution to that problem would be to use software for watermarking photos on your picture. That way, even if you share it with people online, they won't be able to use it without making fools of themselves. If there's your name on the photo, it will be hard for them to claim it's theirs. Watermarking a photo also helps with tracing the origin of the picture - for example if you put a watermark with your site's URL on the picture, people will come looking for similar images on your website.
But let's step up to the more important part - how do you watermark a picture? Surely, there must be software to do it, but how exactly is that done? Is it complicated? What software should be used? What if you have more than one picture? Would it take forever to finish watermarking your photos?
As an answer to the last few questions, the process of doing something to multiple items is known as "batch processing", and there are tools to batch watermark photos. One particular tool that can be recommended due to its ease of use is the Batch Picture Protector, by a software company called SoftOrbits.
Its features revolve around its ease of use - you can make transparent watermarks on nearly all picture formats with just a few mouse clicks, and for the more tech-savvy, there's a command line interface which allows the tool to be used in scripts, making image processing very easy. It is compatible with the Windows 7/ Vista systems, and it's certainly a good choice.
You may run into some other tools for the same task, but some of them take a little getting used to, so if you're a novice with computers, we suggest using the program above or something similar to it.