By activating DDPI, a client is allowing the broker to debit the holdings on their behalf without entering the TPIN & OTP. While Pocketful's DDPI facility is safe, as a broker, we'd still advise our clients to use eDIS as it gives them more control over their holdings. Refer this article for more info: https://www.sebi.gov.in/legal/circulars/apr-2022/execution-of-demat-debit-and-pledge-instruction-ddpi-for-transfer-of-securities-towards-deliveries-settlement-obligations-and-pledging-re-pledging-of-securities_57546.html.