Protect DREAMer Confidentiality Act of 2017 This bill directs the Department of Homeland Security (DHS) to protect individual application information submitted to DHS after June 15, 2012, as part of a request for consideration or reconsideration for the Deferred Action for Childhood Arrivals (DACA) program from disclosure to U.S. Immigration and Customs Enforcement (ICE) or U.S. Customs and Border Protection (CBP) for any purpose other than implementing such program. Such information may be shared with national security and law enforcement agencies: (1) to identify or prevent fraudulent claims, (2) for national security purposes relating to an individual application, or (3) for the investigation or prosecution of a felony not related to immigration status. DHS may not refer an individual whose case has been deferred pursuant to the DACA program to ICE, CBP, the Department of Justice, or any other law enforcement agency.