If you’re ever wondering why I mark your images, there are a few reasons, but it is for our protection, yours and mine. In the following links you can read about a woman who posted her personal family photographs on her personal website, and the photographs were stolen and used to promote a high end grocery store in Prague. Can you imagine? So, how can you make sure this doesn’t happen to you? Don’t ever post a full-size copy online. (If it’s a professional photograph, chances are it’s illegal for you to scan and use it anyway, unless you have a specific release from the photographer.) A full-size (full-resolution) copy is large enough that someone who knows images can turn it into a billboard. Seriously… just read the article. But, if it is a web-sized image, there aren’t enough pixels to blow up into a larger size. So, that protects you from your images used on a billboard, but keep in mind that people who don’t know any better (and some that do but don’t care), could still swipe your pictures to use for their own use. Why? Well, you’d be surprised how many people don’t know they can not do it, and if it’s a naive person starting their own business website, they think they can take anything from the web. That’s why when I post images, they are sized for the web (72 dpi), and I always have my information on the images. That way, it at least detracts from people trying to steal them. (Such strange things we have to worry about in this day and age, huh?) Now, with your session, you do sign a model release and I do occasionally use images in displays and promotional materials, but I promise not to sell them to a grocery store in Prague! 
http://www.nbc4i.com/cmh/news/local/article/family_photo_stolen_via_internet_used_in_ad/16498/
http://www.extraordinarymommy.com/blog/are-you-kidding-me/stolen-picture/
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