Existence Lock - Prevents other users from deleting a catalog entry. You can edit or move the catalog entry but you cannot delete the entry. The presence of an Existence Lock prevents anyone, other than the lock owner, from acquiring an Exclusive Lock on the entry. You can apply Existence Lock, Shared Lock, or Update Lock, with the existing Existence Lock, to the catalog entry.
Shared Lock - Prevents the user, including the lock holder, from editing the catalog entry. You can open a model with Shared Lock in a read-only mode; you cannot edit the model. The presence of a Shared Lock prevents anyone from acquiring Update Lock or an Exclusive Lock on the entry. You can apply Existence Lock with Shared Lock to a catalog entry.
Update Lock - Lets only the lock holder edit the catalog entry. The presence of Update Lock on an entry prevents the other users from acquiring any other locks, except Existence Lock.
Exclusive Lock - Lets only the lock holder edit a catalog entry. The presence of Exclusive Lock prevents anyone from acquiring any type of lock on the entry.
Unlock Entry - Lets only the lock holder unlock an entry.