CentOS doesn't has a policy about rejecting proprietary software. Fedora has a partial policy on excluding proprietary software, but they make an exception for firmware which CentOS doesn't according to the GNU project (but this has no sources at all and it is rarely updated). If that is the case, then there will be plenty of proprietary packages in CentOS mixed with free software, not only Linux. I haven't used either system; this is based on the linked pages.

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