|The Open–source PKI Book: A guide to PKIs and Open–source Implementations|
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Oscar is a project of the Distributed Systems Technology Center of the Queensland University of Technology to create a public–key infrastructure. It implements the cryptographic functions using directly the GMP library, unlike other implementations that use OpenSSL. The programming language chosen is C++.
The licensing of Oscar allows the non-commercial usage of the software. To use it commercially, one needs to obtain a license. This is not compatible to either the GNU or the Apache style license.