> Well, I'd be careful with that. The open source project I contribute to (KDE) has quite a bit of GPL'ed code, but it also has quite a bit of other licenses in

> Well, I'd be careful with that. The open source project I contribute to (KDE) has quite a bit of GPL'ed code, but it also has quite a bit of other licenses in use, so it is certainly possible to have arbitrary licenses that make up a given single derivative work. Yes, so long as those other license are GPL-compatible. 3-clause BSD, MIT, ISC, etc. are all GPL-compatible. The license that Envato is allowing or using for the non-PHP theme assets is not, so the question does become one of whether the theme assets are a derivative work.