If you choose to create a portable version, do so legally, respect Avid’s copyright, and keep a backup of your USB drive.
What Is Sibelius Portable? Sibelius is one of the world’s leading music notation software packages, used by composers, arrangers, educators, and students to create, edit, and print professional-quality sheet music. A "portable" version of Sibelius refers to a modified installation that runs entirely from a USB flash drive or external hard drive without needing to be installed on the host computer’s operating system. sibelius portable