From version 2 onwards PsychoPy is distributed under the GNU GPLv3

PsychoPy includes the following files which have other compatible open-source licenses:

ConfigObj (http://www.voidspace.org.uk/python/configobj.html) released under BSD license
    configobj.py
    validateConfigobj.py

pySerial (http://pyserial.wiki.sourceforge.net/pySerial) released under Python License