If the association wins its case, then the unfair contract terms will be declared void for all Steam users.
Valve is not the only company blocking the resale of downloaded games: UFC-Que Choisir also reviewed terms and conditions imposed on gamers by Microsoft, Sony, Electronic Arts and Blizzard, finding similar problems with all of them.
Those companies have dodged a legal bullet, for now, as UFC-Que Choisir decided to take Valve to court first because its online sales platform was the biggest.
The association expects the official copy of its complaint to reach Valve's European headquarters in Luxembourg next week, but it has already sent a courtesy copy to the company's Paris lawyer.
Valve's press spokesman did not respond to a request for comment.
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