xsnap has been relicensed, versions >=1.5.9 are GPL-3 or later. See COPYING and notices in source files. Not sure what we should do for 1.5.6; it contains a permissive but non-standard license. I'd suggest to leave it at "as-is" for now. (Or maybe the ebuild for this old version could be purged?)
+ 10 Dec 2012; Julian Ospald <hasufell@gentoo.org> -xsnap-1.5.6.ebuild, + -files/xsnap-1.5.6-gentoo.patch, xsnap-1.5.9.ebuild, xsnap-1.5.10.ebuild: + fix license wrt #446778, remove old