Sheet music is the worst. I was told, using an online sheet music service, that I was allowed to print the sheet music I had purchased once only and using software I had to install which was developed especially to force this. If the print job failed I would have to repurchase the sheet music. I could not buy a digital copy and print it as often as I liked. When I questioned this policy I was told it was out of their hands, that it was the only model of online distribution that the sheet music cartel or whoever it was would agree to.