I searched for "Powered by phpBB © 2000, 2002, 2005, 2007" and came across this thread. I know it is old but I think that what I have to say is relevant to good reason.
Just an idea for the phpBB group themselves. Not for the original poster.
Right now my own site host's forums are phpBB3 and are being spammed with porn. Just terrible and the host is getting a bad rep because of the forum he has chosen.
Also if it is a requirement of phpBB why do some hosts which offer phpBB for free don't have the "Powered by phpBB © 2000, 2002, 2005, 2007" at the bottom but just a link? Is a link that gives credit to phpBB enough for them because they pay?
Sorry if my questions are out of line but I am learning as I go along and I might be completely wrong in my understanding. Thanks.