Rocksmith 2014 uses a DSA signature to verify the authenticity of songs. This app is a runtime patch for Rocksmith 2014 OSX which allows playing custom CDLC content.
See CustomsForge, How to Add Custom Songs on Mac for more info.
If you have problems please join the CustomsForge discord server so we can help you make it work! https://discord.com/invite/cf
Donations: https://paypal.me/starbfly4
Original Injector: https://github.com/rscustom/RSInjector-Mac