I am not a lawyer, but if I remember correctly, copyright covers expression, not content. Since the Wikidata data model and its representation in JSON is rather unique, an ISBN number in a Wikidata statement seems to be novel to Wikidata.

Would rewriting a sentence from a book and then entering that sentence in Wikipedia violate copyright?

On Sat, Sep 13, 2014 at 11:59 AM, Federico Leva (Nemo) <nemowiki@gmail.com> wrote:
Maxime Lathuilière, 08/09/2014 16:41:
> Google Books API's Terms of Service
> <https://developers.google.com/books/terms> is elusive regarding the
> licence but it certainly isn't CC0. Meanwhile, I guess I'm allowed to
> copy the information by hand, right? It's just facts about the item, I'm
> using this API just like I would have used a newspaper or anything as a
> reference, right? But could I automate or semi-automate (à la wikidata
> game) the import process without being in infringement with either
> Google or Wikidata policies? I would just do the exact same thing -
> taking facts somewhere in the world and adding them to wikidata - but
> more efficiently, no?

Most of that is probably non-copyrightable and Wikidata is hosted in USA
which have no database rights, so it can be legally ok, at least in some
fashion. It's however hard to draw a line, so if there are alternatives
it's better to use other data sources. See also the rather unconclusive
https://meta.wikimedia.org/wiki/Wikilegal/Database_Rights

Moreover, the Google ToS are very clear in forbidding any activity which
would result in you having a copy of their database/of the data the API
provides access to, IIRC even in form of a cache. However, you only want
ISBN? *If* you care about respecting your contract with Google, it may
be wise to directly ask them if they're ok with it.

Nemo

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