Url changed from <a href="http:&#x2F;&#x2F;upvoted.com&#x2F;video&#x2F;the-story-of-optikey&#x2F;" rel="nofollow">http:&#x2F;&#x2F;upvoted.com&#x2F;video&#x2F;the-story-of-optikey&#x2F;</a>, which points to this, which has more background info.