go thru this site.. http://editorialphoto.com/ the form section http://www.editorialphoto.com/forms/termscondnonedit.html provides a form that you ought to provide with all invoices. http://www.editorialphoto.com/forms/index.html For those who supply to magazines, etc..they have a section which tells u the conditions for each magazine. Of course..this is for photographers..so u will have to change to suit your needs. Another good site is http://www.gag.org/contracts/glossary.html for graphic artists.. has a lot of info there on copyright glossary.