If adding code to your footer is all they do, thats really trivial.
Quote:
<div id='spf'><a href='http://blogs.bulldogg.co.uk/bulgariarealestate' title='bulgaria property'>bulgaria property</a></div>Powered by <a href="http://www.phpbb.com/" target="_phpbb">phpBB</a> {PHPBB_VERSION} © phpBB Group<br />
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This and anything like it could easily be removed.
If I remember correctly there was a vB and PHPBB skinning site, that encoded "Spyware" into the templates. (Hid them in weird places too, such as the Navbar templates) I don't believe this site is avilible anymore. About time.
So as I said, could the code in question can be removed.