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There are many different kinds of "open source" licenses. That does not mean that they are free, as in beer, but that they are free, as in freedom to modify the source code. Whether or not you can redistribute this modified source code, or charge for use of the modified source code, depends on the specific license.
Most of us aren't attorneys. Nevertheless, most of us can understand the terms of a license, if we but read it and apply a modicum of thought. Despite that presumed understanding, if one is concerned about repercussions because of distributing and charging for derived code, one would be wise to consult an attorney.
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