Najbolj domače in pravno pravilno je tole:
In 2012 the European Union's highest court, The Court of Justice for the European Union (CJEU) in the case UsedSoft v Oracle made the following decisions:
Oracle's software licence was a contract of sale
the terms of the licence could be ignored
the downloading of the software from Oracle's website by the licensee (now considered a purchaser) exhausted Oracle's right to control further distribution of the downloaded copy
it was therefore not an infringement of Oracle's copyright in the software for the licensee to onsell his licence
the trading of second hand licences and/or copies of the software was lawful.
http://www.lexology.com/library/detail.aspx?g=d1ff4369-afcc-4879-97fa-7a8afd8b3380