All Rights Reserved
"All rights reserved" is a copyright formality indicating that the copyright holder reserves, or holds for its own use, all the rights provided by copyright law. Originating in the Buenos Aires Convention of 1910, it no longer has any legal effect in any jurisdiction. However, it is still used by many copyright holders.
The requirement to add the "all rights reserved" notice became essentially obsolete on August 23, 2000, when Nicaragua became the final member of the Buenos Aires Convention to also become a signatory to the Berne Convention. As of that date, every country that was a member of the Buenos Aires Convention (which is the only copyright treaty requiring this notice to be used) was also a member of Berne, which requires protection be granted without any formality of notice of copyright.
The phrase continues to hold popular currency and serves as a handy convention widely used by artists, writers, and content creators to prevent ambiguity and clearly spell out the warning that their content cannot be copied freely.