They mean proprietary in the sense of "we built one ourselves". You can download source from the links at the bottom of the page: http://www.returninfinity.com/pure64.html
The distribution zip actually just contains binary pure64.sys file and sources for their example kernels. The sources for Pure64 are not included. Also, no information on licensing is included.
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I think that was just a poor choice of words.
They mean proprietary in the sense of "we built one ourselves". You can download source from the links at the bottom of the page: http://www.returninfinity.com/pure64.html
The distribution zip actually just contains binary pure64.sys file and sources for their example kernels. The sources for Pure64 are not included. Also, no information on licensing is included.