DCTSystems apps (including My Lyric Book, DMX2Midi, Midi2DMX, X Air-Guitar and My Playback) do not collect any usage data of any kind. 

They do not access any data, or files other than the lyrics, setlists and media files you specifcially add.

The apps do not share any data with the developer or any third party.

When a song is selected its title may be shared with other devices on the local network, in order to syncronise devices.