Originally Posted by seopo

For a small business it's near enough impossible to police. So you can simply relinquish all controll and have a friendly disclaimer outling your usage policy or perhaps add a watermark with your domain.

Big photo sites have legal teams that try to prevent people stealing their photos, but people still do so you'd have a tought time stopping them on your own.

Personally, I'd just appeal to the good in people and take it from there.