PIDPI stands for PUBLIC INTEREST DISCLOSURE & PROTECTION OF INFORMER RESOLUTION, 2004. PIDPI is a resolution of Government of India. In this case the identity of the complainant is kept confidential for all complaints lodged under it.

Under PIDPI Resolution, 2004, the Complaint should be addressed to either “Additional Secretary and Chief Vigilance Officer, Ministry of Ports, Shipping and Waterways, New Delhi” or “the Secretary, Chief Vigilance Commission, New Delhi”.

The envelope should be superscribed as "PUBLIC INTEREST DISCLOSURE & PROTECTION OF INFORMER (PIDPI)". Name and Address of the complainant should NOT be mentioned on the envelope but in the letter inside in a closed cover. Complaints that are personally related to the complainant or addressed to other authorities may lead to disclosure of identity. Therefore, the complaints should not be sent in open condition or on public portal. Documents that reveal identity should not be enclosed or mentioned in the complaint. E.g.: documents received under RTI, etc. Name and Address should be mentioned on the letter inside the envelope for confirmation purposes. It is to keep in mind that the complaints where confirmation is not received are closed. The Anonymous / pseudonymous letters are not entertained.