Case:

Ronald Swoboda sued Parody Productions (parent company of Hero Decks) in Louisiana for publishing baseball cards showing his picture and his record without having paid him.He asked for an injunction and damages.Parody, an Ohio corporation, requested exemption from jurisdiction and it was granted.Swoboda appealed.

Please give me a couple of sentences defining the term "purposeful availment" as the term is used in the Swoboda case. That term is mentioned in both of the precedents cited in the case and in the court's ultimate resolution of the case itself. It's the key principle.