I applaud their commitment to privacy, and this is definitely a step in the right direction. However, their pledge to publish the client app's source code seems pretty meaningless for proving privacy unless all their users plan on compiling from source. How do their users know a pre-compiled binary doesn't have a backdoor?
This would be a good way to look at the Dropbox/DMCA issue. <a href="http://techcrunch.com/2014/03/30/how-dropbox-knows-when-youre-sharing-copyrighted-stuff-without-actually-looking-at-your-stuff/" rel="nofollow">http://techcrunch.com/2014/03/30/how-dropbox-knows-when-your...</a>