Musicians and piano owners cannot legally create or modify proprietary player piano files without reverse-engineering vendor formats

Self-playing piano owners who purchase music from vendors like PianoDisc are locked into a closed ecosystem where they cannot create, modify, or share their own arrangements because the MIDI encoding format is proprietary and undocumented. Musicians want to compose original pieces for their player pianos or customize purchased music, but lack tools and legal clarity to do so without reverse-engineering vendor file formats, creating friction between ownership rights and technical capability.