Unless addressed in the transfer agreement, the publisher may forbid an author to do the following:

• Post the work to the author's own web site, an institutional repository, or a subject-based repository.
• Copy the work for distribution to students.
• Use the work as the basis for future articles or other works.
• Give permission for the work to be used in a course at the author's institution.
• Grant permission to faculty and students at other universities to use the material.

An author's addendum is a standardized legal instrument that modifies the publisher's agreement and allows the author to keep key rights. The addenda usually spells out what rights the author does or does not have in several key areas:

• The extent of the author's ability to continue to use the copyrighted work even after the transfer of copyright to a publisher, including the ability of the author to make copies of the work or prepare new works based on the copyrighted work.
• The author's ability to authorize others to use the work.
• Whether and when the author's institution can make any use of the work.
• Whether and when the author's funding agency can make use of the work.
• When and under what circumstances, if any, people at other institutions can use the work.
• What legal protections are available to the author.[1]

Addenda For Use
An addendum may be generated automatically online at the Science Commons, SPARC and MIT Author Addendum: http://scholars.sciencecommons.org/. Simply enter information about the author and publication to generate a PDF which may be submitted to the publisher.