ZyXEL Communications NSA-220 Plus User Manual page 504

Appendix E Open Source Licences
This is indicated in the license + copyright comment block at the top of the source
file.
"Practical Guidelines:
"Distributing PHP
"Contributing to PHP
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Copyright (c) 1999 - 2009 The PHP Group. All rights reserved.
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Redistribution and use in source and binary forms, with or without
modification, is permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The name "PHP" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact group@php.net.
504
The PHP License, version 3.01
NSA-220 Plus User's Guide