I read that in order to create hardware that are iBeacon enabled, I would need just the iBeacon license
"People Making Devices With iBeacon Technology
If you are interested in manufacturing devices with iBeacon technology, you will need to obtain a license before building these devices. Please visit https:/developer.apple.com/ibeacon/ to apply for an iBeacon license. Licensees receive access to technical specifications, a license to use the iBeacon logo, and the iBeacon Identity Guidelines."
I clicked on the "Download Artwork and specification" link, agreed to the license agreement there. Is that the iBeacon license? Is this sufficient? Or would I need the MFi license as well.