Since the M-series cards, Nvidia requires a virtual GPU license for each user connecting to the card. Nvidia has made a Linux appliance that serves as the GPU licensing server. Every time an end user signs in, a license is assigned to that user. When there are no licenses available, the end user might experience a failing session or a black screen when signing in. Nvidia licenses are often a set-and-forget system, and IT teams do not usually have to actively monitor the Linux appliance and the licensing manager.