A keyserver is a type of software that allows system administrators to control and monitor the usage of licenses on their network. In this setup the keyserver manages the list of available licenses for a particular program and grants access based on preset preferences.
SketchUp does offer Windows Lab licenses configured for use with keyserver software. This license type will allow you to install or image SketchUp onto multiple machines; the keyserving software will then monitor license usage. Your license will need to be set up as a single-user license specifically for this use.
If you have questions about setting up a keyserver or using it to manage your licenses, please contact your keyserver software company for instructions.