(740 ILCS 165/2)
(from Ch. 126, par. 12)
A judgment in any jurisdiction for or against the plaintiff upon
the substantive merits of any action for damages founded upon a single
publication or exhibition or utterance as described in Section 1 shall
bar any other action for damages by the same plaintiff against the same
defendant founded upon the same publication or exhibition or utterance.
(Source: Laws 1959, p. 1907.)