Proprietary means not open-standard&#x2F;open-source.<p>I remember this coming up on tech news sites a few years ago when I discovered f.lux...  this article also makes mention of the patent-pending nature of the software: <a href="http:&#x2F;&#x2F;readwrite.com&#x2F;2013&#x2F;09&#x2F;23&#x2F;flux-a-hack-for-your-devices-and-your-sleep-schedule" rel="nofollow">http:&#x2F;&#x2F;readwrite.com&#x2F;2013&#x2F;09&#x2F;23&#x2F;flux-a-hack-for-your-devices...</a>