free course (noun) free hand: freedom to act and make decisions
Sinonime: backdoor, backstairs, camouflaged,
clandestine, classified, cloak-and-dagger, close, confidential, covert, cryptic, discreet, disguised, dissembled, dissimulated, furtive, hush-hush, in ambush, incognito, inside, restricted, secretive, sly, sneak, sneaky