"The Court observes in particular that limiting the application of the principle of the exhaustion of the distribution right solely to copies of computer programs that are sold on a material medium would allow the copyright holder to control the resale of copies downloaded from the internet and to demand further remuneration on the occasion of each new sale, even though the first sale of the copy had already enabled the rightholder to obtain appropriate remuneration. Such a restriction of the resale of copies of computer programs downloaded from the internet would go beyond what is necessary to safeguard the specific subject-matter of the intellectual property concerned.
Moreover, the exhaustion of the distribution right extends to the copy of the computer program sold as corrected and updated by the copyright holder. Even if the maintenance agreement is for a limited period, the functionalities corrected, altered or added on the basis of such an agreement form an integral part of the copy originally downloaded and can be used by the customer for an unlimited period."
Essentially, the court said that once a software company sells "a copy of a computer program," its "exclusive right of distribution" is eliminated.
So what does this mean for services like Steam and Origin? Technically under EU law, you now have the right to sell your games.