The effective user ID of the calling process must be that of the super-user or match the creator or owner of the semaphore set.

调用进程的有效用户ID必须是超级用户，或者可以与该信号量集的创建者或所有者匹配的用户。

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But now, after 17 years, the ban has been lifted after an appeal from Bethesda Softworks, who now owns Id, original creator of Doom.

FORBES: Germany Lifts Ban on Doom Sales after 17 Years

Legendary videogame designer John Carmack --creator of games like Doom and Quake, and founder of id Software --owns rocket-technology startup Armadillo Aerospace .

FORBES: The New Space Race