I used to fish a section of a Class A on private farm property and asked permission the first time I went.
The owner was 87 years old, a really nice guy and we even hid from his wife while we shared the beers I always have with me in a cooler in my car.
However, he had steadfast rules on asking permission EVERY time, parking in a specific location and where to access the field I had to cross to gain access to the creek.
I found out that the asking every time thing was so he could deny access to the second person that asked on a given day ensuring the first angler got the stretch to him or herself...
Like I said, really nice guy and I always made sure I got there early and had beer. 🙂