In article , Robert
Moore wrote:

EDR wrote

Class C: you have to establish two way radio contact and have
permission.

"Permission" is not acceptable air traffic control terminology.
If I am not told to "remain clear", I CAN fly in Class C and D.

I understand that. I went round and round with FAA HQ on this issue in
the 1980's. Permission is the word they used. From there the arguement
turned to what constituted permission.