GP 2015 R2 adds some additional security features like Microsoft Dynamics GP2015 R2 Feature of the Day – Mask Employee SSN on Reports
Microsoft Dynamics GP2015 R2 Feature of the Day – Mask Employee SSN on Reports – Microsoft Dynamics GP Community
Tips & Hidden FeaturesReporting & BIGP 2015
Archived post from 2015. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.