Subtyping is a notion in programming language theory where a subtype, which is a data type, is related to a supertype based on the notion of substitutability, where program elements such as functions and subroutines that are written for the supertype will still operate if given the subtype instead. Subtypes are an essential concept in...
A client access license (CAL) is a type of license binding the licensee to a set of user terms limiting how the organization's services are used. This is typically done using software accompanied by a certificate of authenticity and a several digit license key. The end user is required to verify their CAL by transposing the license key numbers into a designated field prior to downloading the software.
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