How Do You Defend an Intellectual Property Litigation Claim?

The plaintiff bears the initial burden of establishing a prima facie case of infringement, meaning they must present sufficient evidence that a reasonable fact-finder could conclude infringement occurred. Once the plaintiff meets that threshold, the burden may shift to the defendant to prove certain affirmative defenses. Understanding which party must prove what at each stage is critical because it shapes whether you can move to dismiss early or must prepare for summary judgment or trial.

In intellectual property litigation, the plaintiff's failure to establish any element of their infringement claim can result in dismissal or summary judgment in your favor. Common weaknesses include inadequate proof of ownership, failure to show your conduct actually infringes the claimed scope of protection, or inability to prove damages with sufficient specificity.

Evaluate jurisdictional and service defects immediately upon receiving the complaint. Courts may dismiss a case if the plaintiff cannot establish personal jurisdiction over you, if venue is improper, or if service of process was defective. A motion to dismiss under federal rules or state civil procedure can preserve your right to challenge the court's authority without waiving substantive defenses.

Timing is critical. If you fail to raise jurisdictional defects in your first responsive motion or pleading, you risk waiving them. Conversely, if you respond to the merits without first raising a procedural defect, courts may interpret that as consent to jurisdiction. Your first written response must be strategically coordinated with counsel to avoid unintended concessions.

In federal court, a Rule 12(b)(6) motion tests whether the complaint states a claim for relief. Even if facts are accepted as true, if the legal theory fails or lacks sufficient factual allegations, the complaint may be dismissed. Patent cases often turn on claim construction disputes resolved early through a Markman hearing, while trademark and copyright cases frequently involve fact questions better suited to summary judgment or trial.

Once litigation is reasonably anticipated or commenced, you must implement a litigation hold to preserve all potentially relevant documents, communications, and electronic data. Failure to preserve evidence can result in sanctions, adverse inference instructions to a jury, or default judgment.

A litigation hold requires notifying all relevant employees and departments that normal document deletion practices must cease and that specific categories of materials must be retained. Email, text messages, design files, source code, manufacturing records, customer communications, and any materials related to the product or service at issue must be secured. Courts have imposed severe penalties on parties who allow evidence to be deleted after a hold notice, so your organization's IT and records management teams must understand the scope and urgency of the hold.

Preserve materials in their original format and location whenever possible. Metadata and file modification dates can become critical evidence. If your systems automatically purge old emails or backup files, work with IT to disable that function for the relevant date range and data categories. Document the hold process in writing, including the date it was issued, the persons and departments notified, and the specific materials covered.

Intellectual property claims are subject to statute of limitations periods that vary by regime and jurisdiction. A timely statute of limitations defense can eliminate damages for conduct outside the lookback period, even if infringement is proven. In federal patent cases, the typical limitations period is six years before filing. Copyright infringement claims generally have a three-year window. Trademark infringement and dilution claims often follow state law, which may impose different periods.

If the plaintiff sues years after infringement allegedly began, you may recover only damages within the applicable period, and claims for pre-suit conduct may be barred entirely. This defense does not eliminate liability but can dramatically reduce exposure. A defendant should raise statute of limitations defenses early because they may support a motion to dismiss or summary judgment if the complaint alleges conduct entirely outside the applicable window.

Copyright and trademark disputes in New York state courts follow procedural rules that differ from federal practice, and timing and notice requirements can create vulnerabilities in the plaintiff's case. In copyright cases, you may assert fair use as an affirmative defense, arguing that your use of the copyrighted material is transformative, non-commercial, or otherwise permitted by statute. Trademark defenses include descriptive use, nominative use, and absence of likelihood of confusion.

Defendants in New York courts should verify that the plaintiff properly registered the copyright with the U.S. Copyright Office or that the trademark registration is current and valid. Registration defects can undermine the plaintiff's standing to sue or limit available remedies. Additionally, bio-intellectual property and specialized IP claims may implicate regulatory compliance issues that create additional defenses or mitigation arguments.

Upon receiving notice of an IP dispute, prioritize securing all evidence before a formal hold is required and consulting with counsel within days to assess jurisdictional and substantive vulnerabilities. Coordinate with your IT and records teams to ensure preservation protocols are implemented immediately. Review the complaint for factual and legal weaknesses, including vague infringement allegations, failure to identify specific products or conduct, or claims that fall outside applicable statutes of limitations. Prepare a detailed chronology of your independent development, prior art, or legitimate use that may support non-infringement or fair use defenses. Finally, assess whether counterclaims or declaratory judgment defenses are available, because these can shift leverage in settlement discussions and may justify early aggressive motion practice.