I have a number of earthcache location on TNC properties and have found Daniel Grenier to be very helpful and good to respond to requests. His issue started with complaints of unauthorized placements and the refusal of the owner to make modifications. In all cases when I have given them to him before submitting there have been minor modifications. The important thing is permission to place the cache, I have a folder of permissions for my caches and have been ask to show them by groundspeak in the past which is fine with me. If folks in the past had permission for all cache locations this discussion would not be taking place, IMO.