Grargar: I think it's not a typo, especially since it appears on so many of the games, but instead an indication that the Desura key uses Topware's proprietary DRM.
Leroux: In that case it's an awkward bundle, and with an awkward lack of precise info about the games. What's that supposed to mean, DRM
key? Does Topware have their very own client service on which you need to redeem the game? Which DRM does it use? What's the difference between a DRM key and a Steam key? :/
EDIT: It seems you're right, Desura users warn that the games use online activation. Ugh!
Topware's "DRM" keys are not nearly as bad as they seem. They're a key you "redeem" on the site, and they simply give you an installer to download (some of them are DRM-free, some of them require an activation key). No client, no accounts, no permanent redemption. They're there for you to use whenever the heck you want.
Don't treat these as regular bundle keys, you can redeem them as many times as you want so you really shouldn't go giving these ones away.