They tried to coin a new (unrelated) sense of this term about two years ago in order to try to explain services where the service provider doesn&#x27;t have access to your data. I agree that it&#x27;s confusing because of the much more clearly established technical term with a different meaning, and I don&#x27;t think SpiderOak&#x27;s sense has caught on outside of the company.<p>Can anyone suggest a better term? Some people like &quot;end-to-end encrypted&quot; even in this context, but that doesn&#x27;t really make sense for data at rest, which is almost all of what SpiderOak&#x27;s products deal with.<p>Edit: SpiderOak has had a <i>super</i>-hard time marketing their privacy features to people who aren&#x27;t already familiar with the fairly stark distinctions in play in different access models. I&#x27;m sure they would appreciate if someone came up with a straightforward way to explain &quot;products where the service provider doesn&#x27;t have access to your data, and can&#x27;t get access without your help in any circumstances because of technical constraints&quot;.