What it means
Intellectual property rights are broad by nature, since a patent covers an invention wherever it happens to be applied. A field of use clause narrows a particular licence to a stated application, such as veterinary use only, automotive sensors only, or use in printed media but not in film.
The commercial logic is straightforward. A single exclusive licence covering every application is worth less than several exclusive licences in separate fields, because each licensee will pay a premium for exclusivity in the market it actually operates in.
Drafting is where these deals succeed or fail. The field has to be defined by something objectively checkable, such as a named market, a regulatory classification or a technical specification, because vague wording like "consumer applications" produces a dispute the moment a product sits near the boundary.
Licences also need to say what happens when a licensee wants to move outside its field. Common answers include a right of first refusal over adjacent fields, an agreed uplift in the royalty rate, or a clean prohibition, and the absence of any provision at all is what usually ends up in litigation.
Field of use restrictions appear well beyond patents. Software is routinely licensed for internal use but not resale, trademark licences separate apparel from beverages, and stock image licences distinguish editorial use from commercial use.
In practice
Real-world examples.
Example
A biotech firm licenses a drug delivery technology to a pharmaceutical company for human therapeutics only, and separately to an animal health company for veterinary use. Neither licensee competes with the other, and the firm collects royalties from two markets it could never have served on its own.
Example
A design studio licenses a font family to a games publisher for use in game interfaces but not in packaging or advertising. When the publisher's marketing team puts the font on a billboard campaign, the studio invoices for a separate advertising licence at the rate the contract had already set.
Example
An engineering company buys a machine learning licence restricted to internal quality inspection. Two years later it wants to sell an inspection service to third parties using the same software, and finds that the field of use clause requires a renegotiated licence at roughly four times the original price.
Formula
Calculation
Royalty from a field = net sales in that field x the royalty rate agreed for that field. Total return to the licensor = the sum across all licensed fields.
A university licenses a sensor patent. Rather than granting one all-field exclusive licence, it splits the rights by application.
Field A, medical devices: the licensee sells $8,000,000 a year at a royalty rate of 6%
$8,000,000 x 6% = $480,000
Field B, industrial automation: a different licensee sells $15,000,000 a year at a royalty rate of 4%
$15,000,000 x 4% = $600,000
Total annual royalty = $480,000 + $600,000 = $1,080,000
The single all-field exclusive licence the university had originally been offered was 4.5% on projected sales of $16,000,000, which is $16,000,000 x 4.5% = $720,000. Splitting the rights by field produced $1,080,000 - $720,000 = $360,000 more each year, at the cost of managing two licensees instead of one.Case study
Seen in the real world.
Kestrel Polymers is an invented materials company described here purely as an illustration. It held a patent on a coating that resisted both abrasion and bacterial growth, and its first instinct was to sell an exclusive worldwide licence to the largest industrial coatings company that showed interest, for $2,000,000 up front plus 3% of sales.
Its board asked one question that changed the outcome: which markets would that licensee actually pursue? The honest answer was industrial flooring and marine, and nothing else. Kestrel instead granted a field of use licence covering exactly those two markets at 5%, and over the following three years licensed medical surfaces to a hospital equipment maker at 7% and food processing equipment to a third company at 4%.
The illustrative point is that the clause itself did not create the value; the analysis behind it did. Kestrel's licensing manager kept a simple rule afterwards, that no field would be granted to a licensee that could not show a credible development plan and accept a minimum annual royalty, which stopped fields being locked up by companies with no real intention of working them.
Watch out
Common mistakes.
- Defining the field in marketing language rather than in objectively verifiable terms. Phrases such as "professional market" invite a dispute the first time a product straddles the line.
- Granting a field with no minimum royalty or development obligation. A licensee that never commercialises the technology has effectively taken the field off the market for free.
- Assuming the restriction follows the product down the supply chain. Once a licensed product is sold, the buyer's own use is often outside the licensor's control, so the clause binds the licensee rather than its customers.
Questions
People also ask.
Does a field of use licence have to be exclusive?
No, an owner can grant non-exclusive licences within the same field, though exclusivity in a defined field is usually what commands the higher royalty rate.
What happens if a licensee sells outside its field?
That is a breach of contract and often patent infringement as well, and well-drafted agreements set out audit rights, a higher royalty for out-of-field sales and a termination right.
Can the same product fall into two fields?
Yes, which is precisely why the definitions need a tie-breaker clause saying which licence governs a dual-use product and how the royalty is then split.
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