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    Has been part of the Envato Community for over 5 years Has referred 10+ members Has sold $75,000+ on Envato Market and is now an Elite Author Has collected 1+ items on Envato Market
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BioXD says
It must be under GPL . Because WordPress is under GPL and plugins are using WordPress functions, classes etc.

http://wordpress.org/development/2009/07/themes-are-gpl-too/

So there shouldn’t be any problem as long as you give the credits.

They ask people to release them under GPL v2+ but that doesn´t mean all the authors do that. From their plugin page:

It is customary to follow the standard header with information about licensing for the Plugin. Most Plugins use the GPL license used by WordPress or a license compatible with the GPL . To indicate a GPL license, include the following lines in your Plugin:
4323 posts ThemeForest Reviewer
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Ivor Envato team says
Yeah I’d say so, I’m using one in my upcoming theme and I know woothemes does a lot so I cant see any issue with it.
Be careful man, they lock comments down around here for uttering that name…

Lie.-

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