As mentioned earlier, there is a common misconception what 'copyright' and what 'All rights reserved' means.
Under the Berne Convention, http://en.wikipedia.org/wiki/Berne_Convention_for_the_Pro...
any artistic work (like software) grants the creator full rights, as in 'All Rights Reserved'. This is automatic and you do not need to claim 'All Rights Reserved'. As the owner, you are in the position to attach a license such as the GPL, so that other can use your code (according to the GPL).
Free software depends on copyright; without copyright, you cannot enforce the GPL!
Therefore, when you search for 'All Rights Reserved', you must check that the GPL (or similar) is also attached to the code.