Actually, this should be perfectly fine. Section 7 of GPLv3 allows certain additional restrictions (see http://www.gnu.org/licenses/gpl.html), and those imposed by ID seem to be almost to the letter the same as the ones permitted.
Had they released the code under GPLv2, there would be a problem. And of course one cannot combine GPLv3 code with GPLV2. So there is a small adoption issue there.
But all in all, this is great news.



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