Dear user Evlyn, I have reverted your deletion of tracks in this changeset. While land owners can determine where people may go, they cannot dictate what is shown on OpenStreetMap. If you, as a representative of the land owner, have disallowed access on these paths (and signposted this accordingly) then the paths can be marked "access=private" or "access=no" in OpenStreetMap to ensure that everyone knows that these paths, while existing on the ground, may not be used. Deleting a track from OSM that exists on the ground is considered vandalism.