Learn in the textbookPrevention of Unfair Competition and Software License Agreements
DefinitionA Site License Agreement (サイトライセンス契約) permits use of the software anywhere within the organization or facility set in the contract, such as a company or school, without counting machines one by one.
ExplanationEven if more PCs come into use within the covered scope, no individual extra purchases are needed. For organizations whose number of machines changes a lot, it cuts the work of tracking license counts.
AnalogyIt is close to booking an entire venue so that everyone inside can come and go freely, instead of each person buying a ticket.
Memory hookRemember that site here means a physical location or premises, not a website.