I am planning to write a novel in which the name of one of my character is Agent X but I found out that it has been used as a name of a TV serial.


Under US laws: If your use of an existing trademark (not to mention a REGISTERED trademark) can be viewed as "likely to create confusion" among consumers, as to the source and affiliation of your works, then it would be (by definition) a trademark infringement. In theory, you would need permission from each and every owner of a confusingly similar brand, i.e., in related fields.

However, it is not generally a trademark infringement to write ABOUT existing goods or services and reference their trademarks, especially if your writing clearly disclaims any affiliation or sponsorship.


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