Galactic law

Galactic Law was the system of law, similar to international law on Earth, held by many interstellar governments in Mutter's Spiral, and enforced by the Judoon. (DW: Smith and Jones)

Presumably, the Galactic Charter was part of Galactic Law. (DW: The Stones of Blood)

Galactic Law said that developing worlds such as Earth in the 21st century and earlier could not be approached for legal matters, and methods such as a H2O-scoop must be used to transport any places required to be visited to neutral territory, such as the Moon. (DW: Smith and Jones)