Who will have access to the UID database? How will the security of the database be ensured?

Nobody has access to UID database except the CIDR administrators which is periodically reviewed by UIDAI.
• Aadhaar card holder is 
entitled to access their own Aadhaar card information.
•CIDR operations follows strict access protocols to limit access to the database by the administrators.
• The data stored in CIDR is encrypted and the database is secured against hacking and other forms of cyberattacks.