Stallman, CC, and is GPL v3 a free software license?

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Ars Technica notes that Richard Stallman is now withdrawing his support for Creative Commons licensing, complaining that people "lump" all of the licenses together in their understanding of them. This is rather ironic given that the GPL v3 will deny anyone's right to modify the software for use with DRM. So much for "free" as in freedom when it comes to the GPL. One of the main principles of free software is that the programmer must have "the freedom to improve the program, and release your improvements to the public, so that the whole community benefits." Someone please tell me how prohibiting the implementation of DRM does not restrict that freedom? I just don't see how the FSF can call this a free software license.