Those are referring to "BiaB Transcriptions".

By this I think they mean that songs that other people have wrote (hit songs) have been transcribed so they can be played in BiaB. This would violate copyright of the original song for the songwriter.
Much like if I wrote a song, and then you made a BiaB file of my song, it would be infringement. Even if I created my song in BiaB, it is still my song. You can't publish 'transcribed' copies of my song without my permission.


I do not work here, but the benefits are still awesome
Make your sound your own!