Glossary
French: principe de spécialité
The principle of specialty (principe de spécialité, roughly pran-SEEP duh spay-see-ah-lee-TAY) holds that a trademark is protected only within a limited field of activity: the field delimited by the list of goods and services covered by the mark. Identical marks filed for different products must coexist. It is one of the foundational structuring ideas of French and EU trademark law — the reason the Nice Classification matters at all, and the reason a clearance search is never a simple “is this name taken” question.
A mark is protected against the use of an identical or similar name for identical or similar goods and services. When a third party uses the mark for goods and services that are neither identical nor similar, the owner cannot stop that use: its monopoly extends only that far. This is why DELTA can be an airline, a faucet maker and an insurance brand at once — a phenomenon equally familiar in the US, where the “related goods” doctrine performs the same limiting function within the likelihood-of-confusion analysis. In both systems, the practical question is never simply “are the two classes the same,” but whether the relevant public would believe the goods or services come from the same commercial source — classification is a filing and search tool, not the legal test itself, which is why marks in different Nice classes can still be found similar, and marks in the same class can still be found unrelated.
The major exception is the reputed mark (marque de renommée): under certain conditions, a mark with a reputation can be protected even for goods and services that are not similar. This is the French/EU functional counterpart of US dilution protection for famous marks (blurring and tarnishment), though the legal tests differ — French and EU law require the public to make a “link” between the two marks and one of three specific forms of injury (unfair advantage, detriment to distinctive character, or detriment to reputation), rather than the separate, largely codified US framework built around “fame” under the Trademark Dilution Revision Act. For all other marks, specialty applies with full force, and it is worth remembering that reputation itself is a factual threshold that must be proven, not presumed from a mark simply being well regarded within its own sector.
A US company owns a well-known mark for financial software and discovers that an unrelated French startup has adopted a similar name for a line of skincare products. Under ordinary specialty analysis, software and skincare are neither identical nor similar goods, and the US company’s registration — limited to its own classes — would not block the French use. The only route to relief would be to establish that the mark has the reputation required to invoke the exception, a materially higher evidentiary bar than showing ordinary likelihood of confusion.
The principle drives both filing and clearance strategy: the goods and services claimed define the scope of the monopoly, and assessing a conflict always starts with the similarity of goods and services — see trademark clearance search.
Specialty is the analytical starting point of every trademark opposition before the INPI or the EUIPO, since an opposition based on ordinary (non-reputed) prior rights can only succeed if the goods or services overlap. It also frames how a trademark clearance search is scoped in the first place. See also: likelihood of confusion, trademark class, reputed mark.