Under 17 U.S. Code § 201 - Ownership of copyright, initial copyright ownership is given to the author or authors of a work. Copyright is granted to authors upon creating their ideas in a "tangible format", meaning authors retain initial rights even with unpublished manuscripts. Retaining your copyright allows for the following rights:
But, authors who transfer copyright may lose some - or all - of the rights above, which can include things like posting articles on course websites, copying works for students or colleagues, depositing work in your institutional repository or personal website, and even the right to reuse portions of your material in future work. See Retain your Copyright below for how to ensure your rights.
First, what are your goals? Answering this question will help you when reviewing copyright policies, and when adding an addendum to request to maintain author rights.
The resources below will help you negotiate with publisher to ensure you retain some, or all, of your author rights.
Helps authors generate a PDF form to attach to a journal publisher's copyright agreement to ensure that you retain certain rights.
A site from Columbia Law School, aimed to make clear why you might want to keep your copyrights, and provide information to help you hold onto your rights.