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Questions about OpenCms
The following FAQ answer questions about OpenCms.
Path: FAQ | License questions
Does using the LGPL mean that all additions to OpenCms must be Open Source as well?
OpenCms has a build in module API (which is in fact a Java
interface). All modules that use that API are in terms of the LGPL
"works that use the library" and therefore are not bound by the
However, if additions or changes to the core system are made,
the result is a derivative work, and certain restrictions apply,
the most important being that the license used for the derivative
work must also be the LGPL.
So companies can develop their additions to OpenCms as a
module and choose any license they like. However, the OpenCms core
system and all enhancements or additions to it will stay Open
What does OpenCms cost?
OpenCms is true Open Source Software and thus there are absolutely
no licensing costs for using the software. This, of course,
includes commercial usage on as many servers or clients or
databases as you like.