The unlocks the ability to actually burn the bootable media. The trial version allows you to see the interface and sometimes verify that the software can detect your drive, but it restricts the final "Burn" or "Create" step.
iSunshare Official Purchase Page (Authentic License Information) isunshare ubitkey registration code free work
Here is a breakdown of whether free registration codes for iSunshare UBitKey actually work and the risks involved in trying to bypass the software’s licensing. The unlocks the ability to actually burn the bootable media