A supplemental pleading is what you are after. It requires a motion for permission. Have a look at FRCP 15(d).

If it's old enough to be in the public domain, then you can use it but you will not be able to claim copyright ownership of the poem. If your...

The effective date for a copyright registration relates back to the first date when the Copyright Office has received all three of the required...

Most states recognize a cause of action for damages for commercially exploiting another person's name, image or likeness without permission....

I agree with Paul Goodman. I would add that if you want to qualify for woman-owned business preferential treatment, then you should set up a new...

I agree with my colleague's answers. You might have heard that using material for the purpose of commentary is fair use, but this defense is...

You might bump into distinctiveness problems with a trademark infringement claim, as the phrase in question has generic and primarily...

In the United States, a trademark can come into existence before it is registered. The only way to answer your question, therefore, is to conduct a...

Sculpture is a kind of work that can be protected by copyright, provided it means all the requirements for a valid copyright (such as originality,...

To the other resources my colleagues have cited, I would add Alfred Bell v. Catalda Fine Arts, 191 F.2d 99 (2d Cir. 1951), where the court...