Research in Motion (RIM) is the name of the company that makes the BlackBerry.
That message means that someone installed a blank IT policy to your device written by me that I wrote several years ago to remove IT policy restrictions placed on devices by corporations. On older devices there was no means of removing an IT policy and the only way to get rid of the restrictions was to place another IT policy on the device with all the restrictions open. This is what "Method 2" describes above.
However, on all newer devices with OS 4.5 and higher it is now possible to remove the policy as stated in the first post under "Method 1." I no longer have the blank policy posted for download as it's rarely necessary anymore and many people use that method when they don't need to. The text of the IT policy written by me is posted in the first post so that anyone wanting to know what it included can see it.
You can remove that message by changing the info in the "Owner" section in Options.
Hope this helps.