"Therefore the new acquirer of the user licence, such as a customer of UsedSoft, may, as auttaku said:What people dont seem to realise is that all this ruling means is that is is LEGAL to resell digital downloads NOT that the ability to do so has to be provided. So yes you can if you wanted to resell that drm free game you just bought off GOG, but nowhere does it say steam must provide a way for you to sell on games you have bought from them...
lawful acquirer of the corrected and updated copy of the computer program concerned,
download that copy from the copyright holder?s website. "
From the ruling. You have the license so the copyright holder has to provide access to a copy. I think given it's "copyright holder" that this will produce further complications with things like Steam as they mostly have distribution rights and unless it is one of "their" games then you pretty much circumnavigate them.
Interestingly enough the sale of the license also grants the sale of all updates and alterations as well so stuff like online pass and dlc integrated into the program must also be made accessible to the new owner of the license.
Disclaimer:I'm completely shattered and dosed with painkillers so any or all of that could be complete nonsense........