All market participants that utilize the ISDA SIMM^TM are required to obtain a license from ISDA for its use.  This includes vendors that provide ISDA SIMM-based services, administrators or vendors that use third-party SIMM-based services as part of their own service offerings and end-users of the ISDA SIMM margining their trades utilizing the model. ISDA has different licenses for different types of end users, administrators and vendors.

Please see the document below for further information.