If I understand correctly, he did a lot of the work with the idea of selling hotels an alternative to the keycard programmers that come with the locks, and the company that did that purchased stuff to work with.<p>This story has lots of discussion of it:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=4281722" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=4281722</a><p>Especially this comment:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=4282666" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=4282666</a><p>(Also, not all hotels, just lots and lots of them that used that particular implementation)