Lots of companies limit what you can and cannot do with their software. I copied the following from Adobe's website and it pertains to the academic versions of their various applications.
Adobe offers qualified educational institutions, organizations, and end users (such as administrators and students) the opportunity to buy Education versions of our products for administrative or educational instruction purposes only.
Educational institutions and organizations must meet one or more of the following criteria to qualify for the education discount and purchase Education Versions of our software:
* Accredited public or private universities, colleges, and community colleges that grant degrees requiring at least two years of full-time matriculation
* K-12 schools, school districts, administrative offices, and boards of education that purchase for the schools above
* Hospitals, libraries, labs, and museums wholly owned and operated by the schools above
* Home schools approved by Macromedia at its sole discretion
* Accredited vocational schools (i.e., trade schools providing certificates for specific specialties, such as Heald Business School)
* Training centers qualified to purchase the Macromedia K-12 Training Center Solution
As set forth in the EULA, Education versions cannot be used for any commercial purpose. A commercial purpose is any revenue-generating activity beyond an educational institution's usual and customary educational activities.
If a software manufacturer states that you cannot sell something that you have created using their software, then doing so is in violation of the EULA and therefore illegal.
Here's the url.
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_19592#eduETA: I wonder how many paysite creators are not only violating EA's EULA, but also Adobe's by using educational versions of Photoshop to edit textures.