SPARC has announced Author Rights, "an educational initiative to inform faculty across all disciplines about how to use the SPARC Author Addendum to secure their rights as authors of journal articles." Learn more on the resources page by reading

• the brochure (there is also a pdf of the brochure and a poster)
• the Author Addendum

For those not familiar with the Author Addendum, Peter Suber explains

SPARC’s Author Rights brochure identifies the rights faculty have as copyright holders and encourages them to retain the rights they need to ensure the broadest practical access to their articles. It explains how to use the SPARC Author Addendum and even gives tips on what to do if the publisher rejects the Addendum. It also offers specific language authors can insert in a publisher agreement when their article will be deposited in NIH’s PubMed Central.