Abstract: A job management apparatus includes a detection section that detects the number of unused licenses, a determination section that determines whether or not the number of unused licenses is sufficient to cover the number of licenses necessary for execution of a first job to be executed, and a job control section that sets a used license that is used by a second job into an unused state, in which a priority rank assigned to the second job is lower than a priority rank assigned to the first job, when the determination section determines that the number of unused licenses is not sufficient to cover the number of licenses necessary for execution of the first job, and allocates the used license set into the unused state to the first job.

Abstract: There is provided a technique capable of reducing load to management of jobs which are made executable based on licenses.

Abstract: A paper delivery system having a printing unit with an upstream tractor and a downstream tractor disposed on an upstream side and a downstream side, respectively, of the paper delivery unit in the direction of paper delivery, a coupler coupling the upstream tractor and the downstream tractor to each other and a support shaft for supporting the coupler so that the coupler is movable in a direction transverse to the paper delivery direction and a resilient member positioned between the coupler and a fixed frame of the printing unit for energizing the coupler in a predetermined direction for constantly holding the coupler at a certain position in relation to the support shaft.