Aadhaar authentication permission allows designated market entities to provide e KYC for investor KYC subject to UIDAI and regulatory compliance. Permission is granted for designated market entities to perform Aadhaar Authentication via the e-KYC facility for investor KYC, provided they register with UIDAI as KUAs, enable SEBI-registered intermediaries to register as sub-KUAs under UIDAI-prescribed agreements, and comply with UIDAI privacy and security standards and applicable regulatory requirements; stock exchanges and depositories must notify participants, amend rules for implementation, report monthly on status, and monitor compliance, with permissions subject to withdrawal if standards are not maintained.