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GnuTLS, the GNU Transport Layer Security Library, is a free software implementation of the SSL and TLS protocols. GnuTLS is primarily licensed under the Lesser GPL; some parts are licensed under the GPL.
GnuTLS is comparable to OpenSSL, but OpenSSL's license is not compatible with the GPL .
As GnuTLS's licensing is compatible with the GPL, it is used in software like GNOME, Centericq, Exim, Mutt, Slrn and Cups