[Gretl-users] license of gretl script

Hi, I have written some gretl scripts which I would like to publish, but it seems like some parts of it are covered, or might be covered, by patents. But I think I could publish the code with some strings attached, i.e. only use in academia, no allowance to give code to somebody else. Now my question is, if it is possible to publish gretl script code under my own terms, or whether gretl scripts are a derived work of gretl and must be GPL licensed when they are distributed? For example perl can be GPL licensed, too, but under http://dev.perl.org/licenses/ the developers give the permission to distribute perl code under a non-free license. I didn't found any thread on this topic on the mailing-list, so if this has already been discussed, I'm sorry? Christoph