Does anyone know of a free utility that will convert PDF docs to TIFF format without watermarks appearing on the output?

You know anyone with a Mac? Preview will open a pdf and save to TIFF.

Unfortunately I don't know any converters for Windows offhand.

TIFF files are massive!

pst: the watermark is for copyright protection !!!!

As long as you extract for your own personal use and do not redistribute you'll be ok.
(ie: fair use policy)

It will be for a PC running XP

Download and install GhostScript and GSview. GSView will let you open PS and PDF files and convert them to virtually anything.