Learn in the textbookPrevention of Unfair Competition and Software License Agreements
DefinitionA CAL (Client Access License) is a license granting access rights, required for each client that connects to server software.
ExplanationCALs are prepared according to the number of parties using the server. How they are counted depends on the product, for example per user, where each connecting person is the unit, or per device, where each connecting machine is the unit.
AnalogyIt is like issuing an entry pass for each person who enters a building.
Memory hookIt stands for Client Access License, which reads as permission for a client to access the server.