Pointless. First of all this won't keep out any forgeries. And secondly you will also be excluding any listing that says, this is NOT a reprint, preprint, autopen ....etc, etc.

If you are thinking about buying autographs off ebay, you may want to copy and paste this into the advanced search, exclude words to make sure that all fakes, prints etc are left out:

print preprint pre-print pre re reprint re-print rp pp ap autopen auto-pen fake copy

It works for me and allows only authentic autographs to be shown!

James