Great point about the risk of backdoors. Although I'd call it "security holes"; backdoor has malicious connotations, and there's really no reason to think the maintainer of popfile would want to do such a thing.

The risk of inadvertent holes is present in a lot of the things we use. (For instance, SOAP::Lite used to have serious issues.) It doesn't hurt to remind folks of the possibility!

Of course, in terms of the number of affected systems, recent security holes in IE, Mozilla, or even WindowMaker are probably going to cause more problems than popfile ever could...
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Mike