Secrecy and non-disclosure are an integral part of any commercial relationship. The attorney-client relationship mandates the lawyer under a moral & professional obligation to maintain his client’s confidentiality.
Without a client’s expressed consent no barrister, attorney, pleader or lawyer is permitted to disclose any communication made to him in the course of employment as the communication which is made between a lawyer and client is a privileged one.
Indian Evidence Act 1872 has been designed solely to protect the client’s interest. So NO such NDA require.