"We are not allowed to speak."
Translation:Kami tak boleh berbicara.
The meaning is the same, it is speaking. However there is technically a difference. Bicara (berbicara) is used if we speak. Kita berbicara dengan paman. If you are looking out the window of your house and see two people speak, you can say. Saya lihat dua orang bercakap-cakap. It is always bercakap-cakap. Never only "bercakap". However in daily conversation but also in the newspapers and on TV, berbicara is used.