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Your hash is basically a checksum, albeit a somewhat sophisticated checksum. A very crude form of checksum would be the count of characters and/or count of words in a given text. Now ask yourself, would you need a license to publish how many characters and words are in any given copyrighted text? Absolutely not. As long as you do not publish your stats in a way that the original text can be reconstructed from it, it will not be a derivative work of the measured text. And if it is not a derivative work then it does not require any consent from the rights holder of the measured work.

On 4 May 2018 at 20:27, Darren Cook <darren@example.com> wrote:

> But I guess the model and the software that uses the model are two
> different things. ...
> Is the file format of the model very general? Or is it in binary form?

Yes, it is a binary format, and will have completely different contents
each time you tweak some parameters, such as the hash size.

> I've always wonder what if a book is copyrighted but it lacks an
> index. Then someone comes along and builds an index for that book,

That is another interesting example, isn't it.

You could partially reproduce the original: i.e. some of the words in
order, but 99% of the information you need would be missing. So, again,
my guess would be you could release your index under any license you wish.

Darren

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Re: [tlug] Open source license (wikipedia)