As we work through the requirements of PCI DSS, we’ve run into several calls for securing data against “unauthorized users.” Operationally, this makes sense–cardholder data should be protected against use or viewing by people that don’t have a reason to do so. However, any effective IT security system must have a method to ensure that only authorized individuals access resources. This is what the seventh requirement of PCI DSS 4.0 addresses–restricting access to system components and cardholder data.