Ubisoft has detailed Far Cry 4's Keys to Kyrat program, a feature that will let players invite their friends to play co-op even if they don't own the game.

Available exclusively with the PlayStation 3 and PlayStation 4 version, the program gives players 10 keys which can be given to PSN friends who do not own the game, allowing them to jump in and join in the co-op action.

These keys grant access to the open world for a 2-hour trial period, in which you can explore Kyrat and take down outposts, as well as gain in-game rewards.

Far Cry 4 launches November 18 on PS4, Xbox One, PC, Xbox 360 and PS3.

Source: press release