If you stand on a street corner and yell back and forth at your neighbor across the street, is somebody standing 100 feet away from you with a tape recorder capturing your conversation violating your privacy?
Privacy is defined as
1. the state of being private; retirement or seclusion.
2. the state of being free from intrusion or disturbance in one's private life or affairs: the right to privacy.
3. secrecy.
4. Archaic . a private place.
At no time does a conversation among 1- many person ( and yes 1 said because there are some people that talk to themselves) yelling back and forth constitute privacy. This is exactly the problem, Google was found to be collecting information from wireless devices that where unsecured. I would say if Google's camera van is rolling around and trying to attack secured networks then there would be a problem but this is not the case. I am not up to date on any laws from Germany but with a lot of country's now a days it is illegal to have unsecured wireless/ having your access point found to be downloading pirated material. If this is the case for Germany Google is doing more for their privacy then you give them credit for. An easy fix for this is unless you know what you are doing, wire your network or secure your wireless.
Term, holidays, term, holidays, till we leave school, and then work, work, work till we die. -- C.S. Lewis