OpenSSL [SEP] license
License, which means that the terms of both licenses apply. The OpenSSL License is Apache License 1.0 and SSLeay License bears some similarity to a 4-clause BSD License.
As the OpenSSL License is Apache License 1.0, but not Apache License 2.0, it requires the phrase "this product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit" to appear in advertising material and any redistributions (Sections 3 and 6 of the OpenSSL License). Due to this restriction, the OpenSSL License and the Apache License 1.0
are incompatible with the GPL.
Some GPL developers have added an "OpenSSL exception" to their licenses that specifically permits using OpenSSL with their system. GNU Wget and climm both use such exceptions. Some packages (like Deluge) explicitly modify the GPL license by adding an extra section at the beginning of the license documenting the exception. Other packages use the LGPL-licensed GnuTLS and MPL-licensed NSS, which both perform the same task.
OpenSSL announced in August 2015 that it would require most contributors to sign a