What requirements did the Berlin conference impose on European nations claiming colonies in Africa?

Two requirements the berlin conference imposed on european nations claiming colonies in africa are:

Securing written, signed permission from the colonized territories leader. Actively occupying the territory, as shown by a flag and keeping a police force.

The following are two requirements that the Berlin Conference impose on European nations claiming colonies in Africa:

Notifying other European nations when taking possession of African territories. Actively occupying the territory, as shown by a flag and keeping a police force.

Explanation:

The Berlin Conference of 1884 and 1885 regulated European colonization and trade in Africa during the New Imperialism period. During the Conference a series of regulations were set in order to lay a framework for colonization.

One of the requirements the conference impose on European nations claiming colonies in Africa was that any nation taking possession of n African territory should notify the rest in order to make that possession official and validated.

Another requirement was that the colonizing nation needed to actively occupy the territory, either by showing a flag or by having a police force in the land.