Passage: Strong cryptography network protocols such as Secure Sockets Layer, I2P, and virtual private networks obscure the data transferred using them.  As all electronic commerce on the Internet requires the use of such strong cryptography protocols, unilaterally downgrading the performance of encrypted traffic creates an unacceptable hazard for customers.  Yet, encrypted traffic is otherwise unable to undergo deep packet inspection for QoS.

Question: Performance of encrypted traffic on the internet must be downgraded to perform what type of inspection for QoS?
deep packet