I studying the possibility to sell additional levels for my game ( http://devnewton.bci.im/projects/newton_adventure ).
I see two way of doing this:
- sell downloable level packages (DownLoable Content, DLC)
- make some levels inacessible and sell activation keys. (UnLockable Content, ULC)
DLC is harder to implements, but is well known by players and more likely to be accepted by the free sotfware community.
ULC is easy to implements, but is very uncommon in free softwares and I fear that it won't be accepted/understood.
Note that I just want a way to propose to buy, not force to buy. Since I do libre software, I dont want to invent a Digital Right Management and if somebody want to grab my code and remove the level lock or download the additonnal level and share it with his friends, that's ok.
What do you think of DLC vs ULC?