Registration is not just about unlocking the software. It provides:
How to activate or register your Avid Sibelius product. Last Updated : May 13, 2022. Products Affected : Sibelius, Sibelius First, Sib. 6.x: Editing Instrument Ranges (re red notes) sibelius register
Note: Perpetual licenses without an active Update Plan may require manual deactivation via your Avid account dashboard. Registration is not just about unlocking the software