How to deter thieves from stealing your images and server bandwidth

I read recently about some facts when people were stealing someone else's intellectuals property in web, posted and used it at their own discretion without any permission or even notification to the owner. The blogger tells his own story about How to deter thieves from stealing your images and server bandwidth and presents his way of fighting this problem.

Here is an extract

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Nobody likes a thief, and we all want to stop them in their tracks.
Lately I’ve been finding more and more bloggers lifting images directly from my server and using them on their own blogs / websites. Not only is this stealing, but it’s also using up the bandwidth you’re paying your web host for.

This is in my opinion a breach of copyright even if the property writes were not protected in a proper way. What do you think?