Article: The first criminal provision in U.S. copyright law was added in 1897, which established a misdemeanor penalty for "unlawful performances and representations of copyrighted dramatic and musical compositions" if the violation had been "willful and for profit." Criminal copyright infringement requires that the infringer acted "for the purpose of commercial advantage or private financial gain." 17 U.S.C. § 506. To establish criminal liability, the prosecutor must first show the basic elements of copyright infringement: ownership of a valid copyright, and the violation of one or more of the copyright holder's exclusive rights. The government must then establish that defendant willfully infringed or, in other words, possessed the necessary mens rea. Misdemeanor infringement has a very low threshold in terms of number of copies and the value of the infringed works.

Now answer this question: What must a prosecuter show after the basic elements of infringement?
that defendant willfully infringed