"The Application must not include software, documentation, or other materials that, in whole or in part, are governed by or subject to an Excluded License, or that would otherwise cause the Application to be subject to the terms of an Excluded License," reads section 5.e of the for the Windows Marketplace.

Included by that umbrella term "excluded license"--explained in section 1.l--are the GPLv3, LGPLv3, Affero GPLv3 license and equivalents, or pretty much "any license that requires redistribution at no charge," as open source evangelist Jan Wildeboer on Wednesday. The discovery of the restriction was made over the weekend by members of a .

In other words, Microsoft wants no open source code whatsoever, and nothing governed by an open source license, in its Windows Phone Marketplace.

The Apple Model

It wasn't long ago that Apple kicked the popular free and open-source video player VLC out of its App Store because the app . Apple is known for its extremely closed nature and its tight-fisted control over its App Store, of course, and now it appears Microsoft is set to take a similar approach.