Unique identification requirement for specified investors mandates UIN allotment and biometric enrollment before permitted market participation. SEBI requires specified investors to obtain a Unique Identification Number (UIN) from the Designated Service Provider (NSDL) by the prescribed deadline; natural person applicants must submit electronic biometric impressions and a photograph and must furnish true information. Specified investors without a UIN are prohibited from transacting in listed securities or units of collective investment schemes after the effective date, and must notify any changes in particulars to the MAPIN database within thirty days. Contraventions attract measures under the Regulations.