I'm not sure how much more clear I can be. Turtl doesn't know your login information, and doesn't know any of the keys derived from your login information. That's the point of the login...it's a familiar way people use to authenticate themselves with a service, but with the added benefit that it's actually generating a master key for them.
Also, not sure how many files there are floating around the internet (and off of it) but it's quite a bit, so comparing file sizes isn't going to give any real information (at least in regards to copyright protection).
I'm not sure how much more clear I can be. Turtl doesn't know your login information, and doesn't know any of the keys derived from your login information. That's the point of the login...it's a familiar way people use to authenticate themselves with a service, but with the added benefit that it's actually generating a master key for them.
Also, not sure how many files there are floating around the internet (and off of it) but it's quite a bit, so comparing file sizes isn't going to give any real information (at least in regards to copyright protection).