EU Rules You Can Sell Your Digital Game Licenses
The Court of Justice of the European Union has ruled that publishers cannot prevent you from selling your licenses for digital content, effectively allowing the sale of used downloadable games.
There is nothing wrong with publishers including disclaimers in their license agreements saying that you can't sell your license, but it Europe, after this ruling, there is nothing that can legally be done to prevent users from doing so. According to the court, the exclusive right of a service like Steam or Origin to distribute a game covered by the license is, "exhausted on its first sale."
There is one catch. The ruling does require the seller of the license to render their own digital copy of the game, "unusable at the time of resale."
You can read the full press release for the ruling by downloading the PDF here.