Its ruling specified that the reseller cannot have any copies or files related to the sold software (you have to sell everything, no keeping a backup, obviously.)
For cases of multiple sub-licenses under the same license (such as buying 5 computer uses of the same Anti-Virus Key,) all sub-licenses must be transferred.
The copyright holder of the software is required to honor this resale, by extending all access to that software/license on their site to the new owner. (Ex, buy a game off the PSN, decide later to sell it to a friend, then Sony must allow that new owner to access it with full rights as though they had been the original purchaser.)
All purchased software in the EU, whether digital or physical, is included under this ruling, and it applies retroactively to all previously obtained content.