“The first sale in the EU of a copy of a computer program by the copyright holder or with his consent exhausts the right of distribution of that copy in the EU. A rightholder who has marketed a copy in the territory of a Member State of the EU thus loses the right to rely on his monopoly of exploitation in order to oppose the resale of that copy… The principle of exhaustion of the distribution right applies not only where the copyright holder markets copies of his software on a material medium (CD-ROM or DVD) but also where he distributes them by means of downloads from his website.”
read in full here http://curia.europa.eu/jcms/upload/docs/application/pdf/2012-07/cp120094en.pdf
So far as I can tell this makes it unambiguously legal to sell any computer software you own for which you have an unlimited usage license in the EU, such as IRIX CDs. Of course it is still up to neko to choose to allow or not selling them on his site but those of us in the EU can go about this without concern now.