"Prevent Unauthorized Transactions in your demat / trading account. Update your Mobile Number/ email Id with your stock broker / Depository Participant. Receive information of your transactions directly from Exchanges on your mobile / email at the end of day and alerts on your registered mobile for all debits and other important transactions in your demat account directly from CDSL on the same day." - Issued in the interest of investors.
KYC is one time exercise while dealing in securities markets - once KYC is done through a SEBI registered intermediary (broker, DP, Mutual Fund etc), you need not undergo the same process again when you approach another intermediary.
Investment in Securities Market/Commodity Market is subject to Market Risk.