(November 3, 2020, 12:45 PM EST) -- ALEXANDRIA, Va. — A software company that is already maintaining a declaratory judgment action involving a Blackberry Ltd. patent in California federal court on Nov. 2 challenged the validity of the patent with a petition for inter partes review (IPR) by the Patent Trial and Appeal Board (MobileIron Inc. v. Blackberry Ltd., No. IPR2021-00157, PTAB)....