Encrypted and Searchable? How? (Score 1)

This sounds like an interesting idea. People have been doing similar things with applications like Evernote for a long time, collecting snippets and sharing them with several devices. This sounds even easier to use, with a few options to aggregate and classify results and, even as off-putting as this idea may be to privacy-minded individuals, there is probably a relatively large demographic of people who would be interested in doing this. That said -- I find their claim to be encrypted and searchable from cloud services (including Google) to be dubious. My understanding is it is simply impossible to have an always-available searchable index that is also encrypted. Does anyone have any insight into what is involved there?