The license for the prism in the basic mode, you can do almost anything you want:
Copyright - subject to the terms of this license, including the license terms and conditions in Section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license to use copyright to reproduce the contribution, prepare derivative works of any input for which the source code is provided and applies a fee or any authorized that you create.
http://compositewpf.codeplex.com/license
You can distribute your code under the GPL and Prism under your own license
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