The entire source code is GPLv2 except for these files:
 * Boost Software License (BSL v1.0)
   * src/http/*
   * src/web/random_device.cpp
   * src/rapidxml/*     (dual licensed with MIT/X11 (BSD like))
 * MIT/X11 (BSD like)
   * examples/wtwithqt/*
 * BSD
   * src/Wt/Auth/passwdqc.h
   * src/Wt/Auth/passwdqc_check.h
 * zlib/libpng
   * src/web/md5.[ch]
   * src/web/base64.h