"Trademark infringement" means using someone else's registered trademark without their permission, which is illegal and can lead to legal consequences.
The owner of a registered trademark may bring suit for trademark infringement to prevent unauthorized use of that trademark. (intellectual-property.legalhelp.org)
We protect our client's trademarks through opposition of confusing trademark applications, enforcement of trademarks rights and defence against allegations of trademark infringement through litigation, arbitration or mediation. (dww.com)
Counsel for major food manufacturer defending a high profile trademark infringement action involving tagline. (foleyhoag.com)