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Numerical Recipes offers two types of licenses: the Personal Single-User License and the Institutional Subscriber License. With the Personal Single-User License, individuals can use the Numerical Recipes code on multiple computers but only one at a time. This license allows for the development of non-commercial applications that can be transferred to others.

On the other hand, the Institutional Subscriber License permits an organization's users to access and utilize the code within the licensed organization. Users must prevent unauthorized transfers of the code and ensure that applications developed using the code are bound to prevent access to the source code. At the end of the subscription, all code copies must be destroyed, except for applications previously qualified under the license terms.

Numerical Recipes prioritizes user safety by disclaiming any errors in the programs and warning against using them for critical situations