-* An end user, via a web app
-* The owner of an installed app
+* *none* is the default state when there are no other permission grants.
+** the object is not included in any list query response.
+** direct queries of the object by uuid return 404 Not Found.
+** Link objects require valid identifiers in @head_uuid@ and @tail_uuid@, so an attempt to create a Link that references an unreadable object will return an error indicating the object is not found.
+* *can_read* grants read-only access to the record. Attempting to update or delete the record returns an error.
+** *can_read* does not allow a reader to see any permission grants on the object except the object's owner_uuid and the reader's own permissions.
+* *can_write* permits changes to the record, including changing ownership and deleting the object.
+** *can_write* cannot read, create, update or delete permission links associated with the object.
+** *can_write* also implies *can_read*.
+* *can_manage* permits the user to read, create, update and delete permission links whose @head_uuid@ is this object's @uuid@.
+** *can_manage* also implies *can_write* and *can_read*.