This version of Mavis Beacon has copy protection involving a "bad" sector on the floppy disk and an invisible file called "Toolworks" that cannot be copied onto a disk image.  The included disk image was produced by copying the Mavis floppy to a hard drive, omitting the uncopyable portion, then converting the resulting folder into a disk image with Aladdin ShrinkWrap 3.5.1.  Until someone discovers a way to hack or patch this disk image, it will run only in demonstration mode.

Update 09/24/2017 : cracked by Gaël ;-)
applied patch : CODE 7, offset 72C8, 4EAD 0072 changed to 4E71 7001
The game now fully runs, not only in demo mode !!
Enjoy !
