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, so they had no jurisdiction over the planet, 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)