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CMSimple_XH is licensed under GPLv3. That basically means you're free to
Many of CMSimple_XH's templates and plugins come with different usage or licensing conditions.
Many template designers and plugin authors offer their plugin under a Linkware License, i.e. the template or plugin may be used for free as long as you leave a clearly visible link to the author in the front or back end.
There are also templates and plugins that come with a commercial license, requiring a payment for use in commercial internet sites, but being often free of charge for schools and non-profit sites as long as a visible link is placed.
Please accept the licensing conditions of the authors.