This is a standalone version of the DLC for the Assassin's Creed IV: Black Flag and you do not need any other release to play it. It's released as standalone officially by Ubisoft.
Assassin's Creed: Freedom Cry
Ubisoft protection : Steam + Uplay
languages : EN/FR/DE/IT/ES/PL/RU/CZ/HU/NL/PT/PT-BR/NO/SE/FI/DK/JP/KR/CN-T
Play as Adewale, an ex-slave turned Assassin fighting for freedom with the help of his own Pirate crew.