What is "all rights reserved"

phr. (context idiomatic legal English) The copyright holder of a creative work reserves all copyright-related rights, typically including the right to publish the work, to make derivative works of it, to distribute it, to make profit from it, to license a number of these rights to other people, and to forbid these uses by any unauthorized people, thus being entitled to take legal action against infringement.

"All rights reserved" is a copyright formality indicating that the copyright holder reserves, or holds for their own use, all the rights provided by copyright law. Originating in the Buenos Aires Convention of 1910, it is no longer has any legal effect in any jurisdiction. However, it is still used by many copyright holders.