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Look at this, it'll answer your questions, most likely.
No, it is not. XOOPS is
GPL.
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Is XOOPS really not requiring their copyright to stay on their users sites?
No, under GPL everyone has the freedom to alter the code of its copy of the program as they see fit. There are two exceptions which may not be altered.
- The piece of comment in the header that specifies the copyright and the license. This is a mandatory piece.
- A display function of the copyright and license to the user. This is for XOOPS modules to see in the module administration.
