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The description on its file description page there is shown below.
The factual accuracy of this file is disputed. All free open source software is freeware because by definition people can just take the code and compile it to run it for free; there's no actual cases of genuine free software that isn't also free of cost
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.