Interesting. I thought that with DP the user data is anonymized by a random function with the value range based on the complete sample set. I also expect that the data is encrypted before transmission and I expect some kind of unique signature which is somehow stored on the device. The transmission itself is certainty logged on client and server side.

If I understand this framework correct the epsilon range for the randomization can be selected by hand before the transmission and also the number of collected parameters is not limited. Why is this called "differential privacy"?