This article is based on an article from Eurogamer in 2012 [1].
There're more recent similar rulings like in France in 2019 [2], but Valve already appealed. It will take many years until there's a final decision.
[1] https://www.eurogamer.net/eu-rules-publishers-cannot-stop-you-reselling-your-downloaded-games
[2] https://www.tomshardware.com/news/valve-steam-resell-games-ban-france-eu,40438.html