PHP Licensing PHP was earlier released under both
PHP Licensing PHP was earlier released under both GPL (General Public License) and its own license, which left the individual user free to choose the license they preferred. Now the program as a whole is released under its own extremely laissez-faire PHP4 license (http://download.php.net/license/2_02.txt). At the time of writing, the Zend license was released under the QPL (Q Public License). Please refer http://www.zend.com/license/ZendLicense/ for more details. Also quoted in their press release is the change to BSD-style license, to provide compatibility with the PHP license, and offer greater freedom of development. Page 22
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