Open source in multiverse

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http://ubuntuforums.org – Howdy! My understanding is that some of the software in the multiverse repository is open source even if its licensing is not free. For example, maelstrom, if I remember correctly, is open source, but there are issues with the license on the graphics. Regardless, I don't want to introduce closed-source software to my systems, but I don't have Stallman Syndrome either. Does anyone know of a good way to enable multiverse but restrict it to packages with source? Also, any ideas why they would lump all this software into one repo instead of separating out open-source/non-free from plain vanilla n (Hardware)