Date: 2022aug21 Language: C/C++ Q. C/C++: SSL/TLS libraries A. Open Source License OpenSSL Apache 2.0 GnuTLS LGPL-2.1-or-later Mbed TLS Apache 2.0 BearSSL MIT (Clean code, but not TLS1.3 yet) These libraries are reliable and multi-platform. All these licenses permit use in closed-source projects. By Microsoft for Windows Only Comments WinInet Probably the right abstraction for most uses SecureChannel Difficult to use (aka Schannel) MFC CInternetSession MFC wrapper around WinInet