[caf]

Have you considered the copyright on the Harry Potter training data?

[mccracken]

fair use - education

[bhaak]

I would still be cautious. There is no need to use exactly this text.

Anyway, there are countries that don't have a fair use policy. So in this countries your repository could not legally be used.

IMHO, this is an unnecessary use of copyrighted material when there are thousands of equally well suited texts that have fallen out of copyright.

[mccracken]

What you say is true - although I'm not sure it matters. There are heaps of art forms which are out of copyright, why should people critique/parody new films? Because they're relevant and people understand the content