Is it possible to have only several units of a Red Hat software product under subscription?

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No, as soon as one unit of a Red Hat software product is entitled to receive Subscription Services, you are required to purchase Subscription Services for all other units of that product as well. This procedure is know as the “all or nothing rule”.

Source: Enterprise Agreement Red Hat 2016-07-05

Geschäftkundenvertrag_Enterprise Agreement_Red-Hat-2016-07-05Download