I'm curious though, how does the law view their access. I mean, they don't keep copies on their servers, so if I use dropbox to transfer dodgy_file.jpeg to another machine, then after the fact the scary law enforcement peoples make a legal request of dropbox, does dropbox have the file on their server, or do they have to access my machines with the file on it?
One of those is Dropbox behaving legally and handing over potential evidence.
The other is Dropbox going onto my machine and taking it to hand it over, which could be argued as stealing and invalidate the evidence.
It all depends though, does dropbox keep a copy of every file?