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General 4. June 2026 · 5 min read

Patent License Agreements: The 5 Clauses That Repeatedly Cause Disputes

A patent license agreement governs how and to what extent a licensee may use another party’s intellectual property right — and this is precisely where most conflicts arise. The biggest sources of dispute are rarely technical; instead, they hide in five recurring contract clauses that repeatedly trigger litigation in practice. Knowing these pitfalls and drafting them carefully helps you avoid costly court proceedings and protect the value of your patent.

Why License Agreements Are So Prone to Conflict

A license agreement defines matters such as the licensing model, the royalty, the contract term, liability, and warranties — and the drafting options here are extraordinarily varied. In particular, the territorial, temporal, and substantive use of the industrial property right must be clearly defined. Precisely because so many parameters interact, it is advisable to seek legal advice when drafting and negotiating. A comprehensive overview of license agreements and our firm’s practice areas can be found at legal-patent.com.

Clause 1: Type and Scope of the License (Exclusive vs. Non-Exclusive)

The most important aspect of any license agreement is whether it is an exclusive or a non-exclusive (simple) license. Under a true exclusive license, strictly speaking even the licensor may no longer use the right within the licensed territory, and the licensee usually also obtains the right to enforce the patent against infringers. Beyond this, the parties must clarify whether the licensee may grant sub-licenses and in what manner the patent may be used.

Conflict arises when the exact scope is not clearly delineated — substantively, territorially, and temporally. An imprecise definition of the licensed subject matter is often the first clause to fail in practice.

Clause 2: Amount and Calculation of the Royalty

What constitutes a fair royalty is a question that always generates a great deal of dispute. Royalties are typically agreed as a lump-sum, per-unit, or revenue-based fee. From the licensor’s perspective, linking the royalty to revenue is often advantageous because it is easier to verify and protected against inflation; a pure per-unit royalty can become unfairly low after years due to inflation.

Key points of contention regarding compensation include:

Must a minimum royalty or minimum turnover be reached ?
Is an entry/initial fee provided for ?
When do royalties become due, and how is the relevant net revenue calculated ?

Particularly with exclusive licenses, a minimum royalty is often stipulated so that the licensee cannot effectively devalue the right through inactivity.

Clause 3: Audit and Inspection Rights (Auditor Reservation)

Because revenue-based fees rely on the licensee’s own figures, the so-called auditor reservation is a classic dispute clause. If the licensor doubts the reported turnover figures, it may engage an independent auditor to review the licensee’s records.

A cost allocation based on a deviation threshold is typical: if the audited figures deviate by less than around 5% from the reported figures, the licensor bears the audit costs; otherwise, the licensee does. Without clearly defined thresholds and audit intervals, disputes regularly arise over bookkeeping and the scope of inspection.

Clause 4: No-Challenge Clause and Validity Risk

Especially important — and often underestimated — is the no-challenge clause. It obliges the licensee not to attack the licensed right, including indirectly through interposed shell companies. This provision is particularly significant for the licensor, since licensees sometimes only pay royalties after infringement proceedings have been brought.

Closely linked is the question of what happens if third parties challenge the validity or use of the licensed patents. The agreement must regulate who is responsible for the defense, who bears the costs, and whether royalties continue to be paid during such proceedings. For standard-essential patents, special FRAND standards also apply, as our analyses of Unwired Planet vs. Huawei and the German Federal Court of Justice’s FRAND II decision demonstrate.

Clause 5: Term, Termination, and Dispute Resolution

The final conflict-prone pillar concerns the end of the contract and the handling of disputes. The parties must clarify the contract term, the conditions under which termination is permitted, and what happens to goods already produced and still in stock upon termination. Frequently, the license is granted for the duration of the protective rights, unless terminated earlier.

For the dispute itself, the choice of resolution mechanism is decisive: ordinary courts or non-public conciliation or arbitration proceedings. In practice, arbitration — for example under the ICC Arbitration Rules — is often agreed, with a defined seat, language of proceedings, and applicable law.

Overview: The 5 Dispute Clauses at a Glance

Clause	Main Point of Dispute	What to Watch For
Type & scope of license	Exclusive vs. simple, sub-licenses	Substantive, territorial, temporal delineation
Royalty	Calculation basis, minimum fee	Revenue- over per-unit royalty, clarify due dates
Audit rights	Credibility of revenue figures	Auditor reservation, 5% threshold
No-challenge & validity	Attacks on the patent	Exclude shell companies, regulate defense
Term & dispute resolution	Termination, remaining stock, jurisdiction	Arbitration clause, set law & language

Takeaways for Contract Practice

Most license disputes can be avoided if these five clauses are formulated precisely and in a balanced manner from the outset. Since royalty rates and contract terms depend heavily on the industry, the reference base, and the depth of manufacturing, individual drafting is indispensable. The team at MDLEGAL / legal-patent.com supports you in drafting, reviewing, and negotiating patent license agreements across all phases of the patent lifecycle.