Isn't the point of discussing this that you actually don't have anything that defines that contract? In terms of the fourth amendment, it seems like there is quite the opposite contract in place already. Also, as an Apple product user outside the U.S., this supposed contract is not something that I ever agreed to.

> And besides, the existence of a contract or not isn't really my point. My point was that encryption isn't an all or nothing situation. You don't either have completely ironclad security where you and only you can access your data or nothing at all.

It is an all or nothing situation. That there is only one unauthorized party able to intercept my data using a back door doesn't change the fact that there is an unauthorized party able to intercept my data using a back door. Whether that is practical for you or not, again, depends on whether you consider the third back-dooring third party authorized.

> There are degrees of technical protection.

I think that maybe the discussion here comes from the fact that you are indeed talking about "technical protection" in general and not encryption specifically. The point of encryption is that only eligible parties can decode the data. If others can decode the data it's not really encrypted, as a matter of definition.

For example, using Google as a mail provider may prove to be poor "technical protection", but the data is encrypted and the authorized parties are part of the terms of service. That the U.S. government can decode my encrypted data without permission may prove to be practical "technical protection", but in terms of encryption it really is a boolean situation.