ASAPI filter for IIS hotlink protection

I want to get my host to install an asapi filter to prevent hotlinking images on my site. My problem is not so much bandwidth stealing as it is messing up my log files.

Is there anbody with experience with these filters?

Also would like to not ask my host to spend money, so are there viable free/opensource ones avaliable?

Thanks!

 

 

 

 

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