Google to encrypt cloud storage

[Nicolas Vigier]

On Sun, 18 Aug 2013, rysiek wrote:

> OHAI,
> 
> PRISM caused a ot of fear but now we can finally feel safe again -- Google 
> will encrypt all Google Drive storage with user-supplied keys:
> http://it.slashdot.org/story/13/08/16/239253/
> 
> So our data will be perfectly safe with them, right?
> Right?.. ;)

I don't understand against who it is supposed to protect your data. It
cannot be against google as they have all the keys. Does it mean google
admit that there are other people with direct access to their data
storage ?