Tridion Resolver remove used items from publishing
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I am trying to do implement a custom resolver for a component as described here by Chris
http://www.tridiondeveloper.com/the-story-of-sdl-tridion-2011-custom-resolver-and-the-allowwriteoperationsintemplates-attribute

I want to remove some of the binaries(mostly pdf's) used in component and prevent them from publishing. I am able to get the list of used items using item.GetListUsedItems method. How do I remove them is my question. 

I appreciate any help 

THanks