The NSPR and NSS DLLs in this directory (libnspr4.dylib, libnssdbm3.dylib, libplc4.dylib, libsoftokn3.dylib
libfreebl3.dylib, libnss3.dylib, libnssutil3.dylib, libplds4.dylib, libsqlite3.dylib) come from the Firefox 2.0.0.20
distribution for OS X.

The source code of NSPR and NSS, which you may use, modify, and distribute, is
available to you free-of-charge from www.mozilla.org under the Mozilla Public
License and other open source software licenses.