Licence

CMSimple is available under four different licenses:

GPL 3 - From December 31. 2009 CMSimple is released under the GPL 3 licence with no link requirements. You may not remove copyright information from the files, and any modifications will fall under the copyleft conditions in the GPL 3. Read the GPL 3.
AGPL 3 - You must keep a convenient and prominently visible feature on every generated page that displays the CMSimple Legal Notices. The required link to the CMSimple Legal Notices must be static, visible and readable, and the text in the CMSimple Legal Notices may not be altered.
- Read the AGPL 3 and the CMSimple Legal Notices.
Linkware / CMSimple Link Requirement Licence - Same as AGPL, but instead of keeping a link to the CMSimple Legal Notices, you must place a static, visible and readable link to www.cmsimple.org with the text or an image stating "Powered by CMSimple" on every generated page (place it in the template).
- Read the linkware licence.
Commercial Licence - (Not available for purchase from January 1st 2010). This licence will allow you to remove the CMSimple Legal Notices / "Powered by CMSimple"-link at one specific domain. This licence will also protect your modifications against the copyleft requirements in AGPL 3.

None of the licenses allows you to change or delete the copyright notice in the top comment of the php-files.

AGPL3 has been approved by OSI, which means that CMSimple has become Open Source as defined by OSI.