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IHL is based on a number of treaties, in particular the Geneva Conventions of 1949 and their Additional Protocols, and a series of other instruments.

Customary international law consists of rules that come from "a general practice accepted as law" and that exist independent of treaty law.

The National Practice database includes the manuals, legislation, case law and other national practice collected by ICRC delegations, National Red Cross and Red Crescent Societies and other partners around the world as part of the mandate bestowed upon the ICRC by the 26th International Conference of the Red Cross and Red Crescent.