What determines the authority of a local ISWC agency to assign ISWC numbers?
The author’s IPI number is the key that determines whether an agency is authorised to allocate an ISWC. The international IPI file indicates the author’s society of membership. If that author’s society of membership is within the juristiction of the local ISWC agency, then the agency is authorized to allocate the ISWC number. This ensures that the same musical work is not assigned multiple ISWC numbers by different local ISWC agencies.