The overal pimcore project is licensed under the terms of a modified BSD Licence. By using pimcore you have to be aware and have to accept and respect that the pimcore distribution includes several third-party Open-Source libraries, which are licensed under their respective Open-Source licenses.
pimcore includes the GPLv3 version of the ExtJS JavaScript framework under the Open Source License Exception for Applications (FLOSS).
http://www.sencha.com/license/
License: New BSD License
http://framework.zend.com/license
License: MIT or GPLv2
http://jquery.org/license
License: LGPL / GPLv2 / MPL
http://ckeditor.com/license
License: MIT
http://www.opensource.org/licenses/mit-license.php
License: MIT
https://raw.github.com/sstephenson/prototype/master/LICENSE
License: Apache 2.0
http://www.opensource.org/licenses/Apache-2.0
License: GPL
http://www.opensource.org/licenses/gpl-1.0
License: GPL
http://www.opensource.org/licenses/gpl-1.0
License: Modified BSD License http://code.google.com/p/sabredav/wiki/License
License: MIT
http://opensource.org/licenses/mit-license.php
License: MIT
http://www.opensource.org/licenses/mit-license.html