The Department of Homeland Security (DHS or the Department) invites public comment on the Advance Notice of Proposed Rulemaking (ANPRM) for potential revisions to the Protected Critical Infrastructure Information (PCII) regulations that provide the Department with the authority to establish uniform procedures for the receipt, care, and storage of Critical Infrastructure Information voluntarily submitted to the Department. These updates would be a step towards meeting the challenges of evolving technology and identifying ways to make the PCII Program’s protective measures more effective for information-sharing partnerships between the Government and the private sector, particularly subject matter areas that have developed significantly since the issuance of the initial rule, such as automated information sharing.