As has been stated above, the folks at '4images' (though they deny it) took a very good portion of the Code from phpBB and used it to build their application. In doing so, they removed our own copyright (an illegal action) and they removed the GPL (another illegal action) from the distribution package, then they placed it under another Propritary License (yet a third illegal action). Now, as I said, they have denied doing this, and have "rewriten" the parts of the code that we "called them on", but anybody with two eyes and a brain larger than an ant will be able to look at the two scripts and see -huge- simularities!
As such, you might say they are not in "good standing" with the phpBB Group. (or at least most of us<grin>)
Now, all this said.... nexialys brought up a good point... 4images (as I mentioned above) is not a GPL product. As such, their Propriety License forbids you to take their code and release it in such an "Open-Source" enviorment as phpBB is. And, secondly, it would not be legal to take phpBB's GPL code and place it within the 4images code-code. (it would violate their propritary license)
So, my best advise, would be to go hunt down another photogallery that is released under the GPL.
I would, fully, 100% recommend:
Gallery - http://gallery.sourceforge.net/
Or, use the one being developed by "Roman Malarev", here at phpBB !!
He recently sent me his latest version for a 'pre check', and it's looking pretty good! Might be worth waiting for!
Anyway, I hope this closing up this issue with the pirates over at 4images <grin>