Almost all my open source files has "All rights reserved" written along the usual "copyright © 2XXX My name" in the first line. I recently heard that, besides being obsolete, this is in contradiction with some permissive licenses, e.g. MIT, that I state in my projects. So, the question is: Should edit all my code to erase the "All rights reserved" phrase?
EDIT for clarity: My doubt is if I MUST edit existing files, or I can leave them as they are, while obviously not including the ARR phrase in new files.