PLR= Private label rights. http://forums.digitalpoint.com/showthread.php?p=4360588 MRR=Master resell rights. http://www.writers-publish.com/ebook-master-resale-rights.html
Even i didnt know the meaning of that, so as the old saying goes, "you learn something new everyday" thank you
PLR means Private Label Rights. That means you can edit and claim the PLR articles or PLR proucts that you acquire as your own.