ARCA23K is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. The audio clips distributed as part of ARCA23K have been sourced from the Freesound database. The license information and attribution for each audio clip can be found in ARCA23K.metadata/train.json, which also includes the original Freesound URLs.