With Visual Studio 2010 SP1 and the Visual Studio Visualization and Modeling SDK for Visual Studio 2010, you are licensed to copy and distribute the necessary files to convert T4 during assembly on the build server (note that only the build server, not arbitrary redistribution). You can simply copy these files from your computer using Visual Studio and the SDK.
Two specified license files: 1) buildserver.txt in the Visual Studio installation directory 2) redist.txt in the VisualStudioIntegration \ Tools \ DSLTools SDK directory.
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