Richard Stallman <rms@gnu.org> writes:

> 	Recipient is granted the right to make copies in any form for
> 	internal distribution and to freely use the information
> 	supplied in the creation of products supporting the UnicodeTM
> 	Standard. The files in the Unicode Character Database can be
> 	redistributed to third parties or other organizations (whether
> 	for profit or not) as long as this notice and the disclaimer
> 	notice are retained. Information can be extracted from these
> 	files and used in documentation or programs, as long as there
> 	is an accompanying notice indicating the source.
>
> Perhaps that last sentence gives us permission to release a free work
> containing the full information, but we had better check that with a
> lawyer first.

Below is the response from Unicode.  Is this sufficient?

Rick also made the following comment:

     Note that if you use any Unihan data, you should look at the UCD
     documentation and pay particular attention to which fields are
     normative and which are not; and to what is "provisional". A lot
     of the data in Unihan.txt is not normative, it is spotty and
     provisional and subject to change and improvement without notice.

So I think anyone working on this should separate the display into a
normative part and a "provisional" part so the user isn't lead to
believe some data are normative but really are unchecked data.