Authors, if your publisher will not permit you to keep your rights to your own work - to self-archive as you please, to sign the Author's Addendum of your choice - be sure to let your librarian know!
After all, there isn't much of a future for a journal that treats its authors this way; such a journal may be said to be Aiming for Obscurity.
Perhaps cancelling the journal would be prudent? Strictly for the financial best interest of the university, of course. There is so much pressure to keep buying more and more journals; it would be a relief to hear that there is one that the library can let go.