Does the pictures have to be seen by everybody ? If it's the case, there are no really solution. You can paste text on the picture with for example the URL of the website. You have to know that the photographer owns each picture he does, so if you did the pictures, you can remember that fact on the website by using a sentence like 'cannot be copied without authorisation'.... and you can ask each person using it illegally to remove it from their website for example.
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