<a href="http:&#x2F;&#x2F;www.gnu.org&#x2F;distros&#x2F;common-distros.en.html" rel="nofollow">http:&#x2F;&#x2F;www.gnu.org&#x2F;distros&#x2F;common-distros.en.html</a><p>This explains why many are not considered free,  though the summary could simply be &quot;the Linux kernel contains non-free blobs&quot; and &quot;they haven&#x27;t promised not to allow non-free in their package repo&#x27;s&quot;