[rarrrrrr]

Done, thank you! We'll probably be playing whack-a-mole on this for the next couple months...

[Aaronn]

The "Welcome to SpiderOak" email that users receive when they first signup for the service mentions the "Zero Knowledge Technology".

[jacquesm]

Another one:

https://spideroak.com/manual/spideroak-on-mobile

quickly found using:

https://www.google.com/search?q=site%3Aspideroak.com+zero+kn...