Oppenheim + Zebrak Names Katheryn Enters and Jeff Kane as Partners

Washington, D.C. (March 6, 2025) — Oppenheim + Zebrak, LLP (“O+Z”) is pleased to announce that Katheryn Jarvis Enters and Jeff Kane have been named partners at the firm. Based out of the firm’s Washington, D.C., office, both Katheryn and Jeff boast nationwide copyright and brand protection practices.

“Jeff is a sharp litigator who has proven himself in all aspects of litigation, including at trial and handling appeals,” said Managing Partner Matt Oppenheim. “Katheryn has more than three decades of experience litigating big cases in serious situations. Katheryn is the rare lawyer who is facile in dealing with data and technology and brings critical eDiscovery experience to the O+Z team.”

In naming Katheryn and Jeff as partners, O+Z continues its rapid growth and success for clients over the past several years. The firm, with Katheryn and Jeff as key players in many cases, has secured major wins and brought blockbuster copyright infringement cases against major tech companies on behalf of its clients in the music, book publishing, and news media industries. In the past two years, O+Z filed high-profile cases against Google, AI companies Anthropic and Cohere, the Internet Archive, SiriusXM, Twitter (now “X”), and Library Genesis (LibGen). The firm has also notched several successes for clients, including winning a permanent injunction against Vinkle, a popular music video maker app distributed on the Google Play store and Apple App Store, for infringing on copyrighted musical works; securing a favorable summary judgment ruling against the Internet Archive in 2023 over its mass digitization, and subsequent online distribution, of copyrighted books, which was affirmed on appeal; and an appeals court victory sustaining our client’s jury trial win and substantial damage award in a trademark infringement suit.

About the New Partners

Katheryn Jarvis Enters

An experienced litigator, Katheryn’s practice focuses on content protection and online piracy. Leveraging her decades of outside counsel and in-house experience, Katheryn brings to bear on clients’ behalf her deep knowledge of eDiscovery and data analytics, finding pragmatic solutions to complex problems, often of a technical nature. As a result, she leads the firm’s teams on eDiscovery and data analytics. Katheryn played a key role in several leading matters at O+Z, including:

• A copyright case in the District of New Jersey alleging the defendant’s textbook solutions service infringed our client’s copyrights in its textbooks.
• A copyright and trademark case in the Eastern District of Virginia against an ecommerce platform for assisting and profiting from infringing storefronts.
• Eight copyright and trademark cases in the Southern District of New York brought on behalf of several major higher education publishers for which default judgments and permanent injunctions were granted against pirate sellers of the publishers’ textbooks and other educational materials.
• Another default judgment and permanent injunction granted by the Southern District of New York on behalf of multiple publishers against a counterfeit ring operating out of India with tens of thousands of infringing sales through defendants operating on their behalf in the United States.

Prior to joining Oppenheim + Zebrak, Katheryn was Associate General Counsel at Celanese Corporation, serving as global environmental health and safety counsel. Prior to that, Katheryn was Special Counsel at Holme Roberts & Owen (now Bryan Cave Leighton Paisner), where her practice focused on complex commercial disputes in federal and state courts and enforcement matters before regulatory bodies. She is also a former nuclear engineer and, as an attorney, has represented clients in regulatory matters and policymaking efforts, including experience in negotiations on behalf of clients at contaminated sites globally. Katheryn received her J.D. from Lewis & Clark Northwestern School of Law, where she served as the school’s law review Articles Editor.

Jeff Kane

Jeff represents plaintiffs in complex copyright and trademark infringement matters, often involving mass infringement. Jeff has successfully litigated lawsuits in virtually every procedural posture including complaint, motion to dismiss, discovery, settlement, jury and bench trial, appeal, and judgment collection. Jeff played key roles in several major matters at O+Z, including:

• Briefing and arguing an appeal in the Seventh Circuit defending a jury’s award of punitive damages in a trademark infringement case. The Court affirmed the jury’s verdict unanimously.
• Conducting and defending expert depositions on behalf of a major academic publisher in a copyright infringement suit raising novel claims about derivative works. The case settled favorably.
• Examining fact and expert witnesses at a jury trial, drafting numerous briefs, and conducting numerous hearings to obtain a favorable jury verdict in a trademark infringement case on behalf of a nutritional supplements maker.
• Authoring key motions in a trademark infringement matter on behalf of the band OK Go against Post Cereal. The case settled favorably.
• Playing a key role in O+Z’s representation of a group of academic publishers in a lawsuit against Shopify alleging secondary copyright infringement of over 3,000 works. The case reached a successful settlement.

Prior to joining O+Z, Jeff was an associate at Robbins, Russell, Englert, Orseck, Untereiner & Sauber (now part of Kramer Levin) and a counsel at Akin Gump Strauss Hauer & Feld. Before entering private practice, Jeff clerked for Judge Richard G. Taranto of the U.S. Court of Appeals for the Federal Circuit, and for Judge Kevin McNulty of the U.S. District Court for the District of New Jersey. Jeff received his J.D. from Yale Law School, where he and a co-counsel won the Potter Stewart Prize for Best Overall Written and Oral Argument in the school’s moot court competition.

About Oppenheim + Zebrak, LLP
Founded in 2011, O+Z is a litigation boutique led by attorneys with extensive experience protecting content and brands. The firm’s practice is at the intersection of technology, new media, consumer behavior, and litigation. We have nearly 25 lawyers dedicated to representing clients in creative and innovative industries against mass infringement, piracy, and related disruptive threats. We routinely navigate these areas and bring to bear our unique knowledge, skills, and relentless focus. Our attorneys have litigated some of the most prominent copyright and internet matters of our time. While our offices are in Washington, DC and New York City, our practice is nationwide and at times even international.