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Share-alike licence

The Creative Commons Attribution Share-Alike license allows re-distribution and re-use of a licensed work on the conditions that the creator is appropriately credited and that any derivative work is made available under “the same, similar or a compatible license”.

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Share-alike clauses in licenses don't preclude them from being 'open' - see

Supporters of SA licences say that it ensures that a work can't be mixed with another (say commercial) dataset and be republished. The resulting mix might be tempting to use, killing off development of the original work, but the combination offers users less rights. Detractors of SA licences say that it divides open data into two worlds - SA and non-SA - and data can't be mixed between them.

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