SpiderOak started using the term Zero Knowledge commercially back in 2007, in an attempt to explain the benefits of End-to-End Encryption to customers in a market where most participants were making wildly misleading claims.  At the time, Mozy and Carbonite were referring to their systems as fully encrypted, even though all they did was transport encryption, or encryption of content and not filenames and folder names.  These days, the term seems to make sense to at least the portion of customers who aren&#x27;t crypto academics. - Erin @ SpiderOak