Legal Question in Business Law in New York

Copyrights are quite inexpensive. Trademarks depends on the level of trademark protection you want. New York trademarks are quite inexpensive and relatively quick. Federal trademark registration is a complicated process and takes a minimum of six months (often more) and is also more expensive. The final cost depends upon a number of factors specific to your registration.

It's unlikely that a patent would be assigned to a t-shirt...but that process is even more expensive, complicated and time consuming than trademark registration.

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