In reply to OneBeardedWalker:
Sheepstor is access land under CROW, so assume owners couldn't shut access to climbers/walkers just like that.
I believe that wasn't the case for Vixen Tor, and an attempt was made to prove long standing public access and define area as CROW access land, which ultimately failed.
I assume Commoners rights also apply in terms of grazing stock at Sheeps Tor.
This blog post on subject of Dartmoor land ownership is very interesting:
https://whoownsengland.org/2021/03/22/who-owns-dartmoor/