An IPI (formerly known as CAE) number is a nine-digit international identification number assigned to songwriters and publishers by their Performing Rights Organization to identify them uniquely as rights holders.
Your IPI/CAE number is searchable by your registered name in your P.R.O.'s repertory database.
IPI: Interested Parties Information
CAE: Composer, Author and Publisher
Note: if you are affiliated as a writer as well as a publisher member, you will be issued an IPI/CAE number for both your writer membership and your publishing entity.