The README file included in the zipball says: The textures which make up this pak file are from numerous (and rather anonymous) talented artists. Many of these textures were found floating around on the Internet with no crediting documentation. I doubt that we are allowed to distribute any material "floating around on the Internet with no crediting documentation", so mirror restriction is needed for this package. HOMEPAGE and SRC_URI are dead, too.
+ 24 Apr 2014; Ulrich Müller <ulm@gentoo.org> quake2-textures-0_beta8.ebuild: + Update HOMEPAGE and SRC_URI. Fix LICENSE, add mirror and bindist + restrictions. Bug 470982. +