Mechanical licensing fees are the responsibility of the purchaser. By purchasing learning tracks from KK Sounds, you agree to the responsibility of paying mechanical licensing fees for the copies that you make. You can learn about and pay mechanical licensing fees by visiting Harry Fox. Mechanical licensing fees are collected to pay royalties to the copyright owners. The current cost is $0.091 per copy and you must pay for a minimum of 25 copies. The arranger owns the copyright on any public domain song. You will likely need to pay the copyright holder directly for public domain songs.