Invoice for demand letter to client?

[rcon]

Hey everybody,

A couple of years a I created artwork for a client's book cover. My invoice was pretty standard: First reproduction rights for the title, market, and medium. All other rights reserved. Payment was received, rights were transferred.

I recently discovered the client subsequently cut-n-pasted half of my artwork for use on another product without my permission.

When I approached the client for a reasonable resolution, he denied any wrongdoing, though my invoice (which he, himself, approved) was specific. So it looks like I have to write a demand letter and possibly serve him.

I'm wondering what terms to put in the demand invoice since the derivative product has already been printed and distributed.

Anyone have any experience with this sort of thing?

Thanks for any advice!

[Qitsune]

This is such specific advise that I think you'd be better off with a lawyer than artist advice, some artist associations and some insurance companies provide legal support included if you are a memeber or using their services. IF you are not memeber of a artist association, they might still be able to give you references in lawyers knowledgeable of IP law.