Exophase
Nothing good will ever come of Exophase.
A free software tag in the PXML is the cleanest solution, but it requires all PNDs to be modified.
Just grepping the license field for strings like "GPL", "MIT", "BSD" etc. should work well enough.
You'd never get everyone to correctly adhere to FSF's criteria on this (which is the driving motivation, right?). For instance: ports of SNES9x are qualified by FSF as non-free because the license doesn't allow you to sell it.
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