WizNote is open source software. Individual users are licensed under GPLv3, been granted the rights to redistribute, use, modify the software in source and binary forms.

Source code: hosted on github
More info: http://wiznote.com/

3rd party credits:

Qt UI framework
Qt is licensed under a commercial and open source license (GNU Lesser General Public License version 2.1). WizNote use open sourced version, thanks for the hard work of all Qt authors!

SQLite
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.

Clucene
CLucene is a C++ port of Lucene: the high-performance, full-featured text search engine written in Java. CLucene is faster than lucene as it is written in C++.

Crypto++
Crypto++ Library is copyrighted as a compilation and (as of version 5.6.2) licensed under the Boost Software License 1.0, while the individual files in the compilation are all public domain.