WordPress › About » License

There is some legal grey area regarding what is considered a derivative work, but we feel strongly that plugins and themes are derivative work and thus inherit the GPL license. If you disagree, you might want to consider a non-GPL platform such as Serendipity (BSD license) or Habari (Apache license) instead.
Teoretic, orice tema e GPL. Inclusiv alea de pe Themeforest.
Cei de la ElegantThemes de exemplu spun clar ca toate temele lor sunt GPL si ca platesti pentru support.