Add license wizard for to promote Creative Commons based licenses
Include a license dialog so people can choose from a predefined list of licenses as well as put in something themselves. See also a post at the Creative Commons mailing list.
The ultimate solution is some sort of wizard which helps people to define the license they want, in a similar way as Creative Commons does on their website. Finally the selected license get stored into the MuseScore file using a standard, but also the PNG, PDF and more.