hmm ... interesting question ...
Originally Posted by Pedaling Pete
from the Audax UK history:
ALSO in 1904, those cyclists who had gained the Brevet d'Audax formed the Audax Club Parisien (ACP) and organised events for Auto throughout France.
IN 1920 ACP upset Desgrange by assisting in an event sponsored by a rival newspaper and he withdrew the club's right to organise Audax events. To avoid infringing the Audax method of riding, and to enable them to carry out their programme of events in 1921, ACP created the Brevets de Randonneur (ie Certificates for Long-distance-cyclists).
THE BREVETS DE RANDONNEUR differ from Audax in that cyclists do not have to ride as a group and keep to a set timetable. Each individual can go at his own pace - 'a allure libre' - and stop at will for refreshment. To prevent racing a series of time checks are established at controls with minimum and maximum time limits.
IT IS THESE REGULATIONS which have been adopted by Audax United Kingdom and the name Audax in the title comes from ACP not the style of the event. AUK is responsible for the Brevets de Randonneur in the UK, not Euraudax events.
So, there you go. Audax UK and Audax Australia take the name according to the precedent placed by Audax Club Parisien, but they still refer to their rides as brevets (as do Germans and Danes, btw). The umbrella American org -- Randonneurs USA doesn't follow that precedent since Americans aren't one for walking in the footsteps in the English, and the Canadians don't have an umbrella national organization and prefer to organize around province.