Unicode Character Database
First of all, let's suppose that the license is DFSG free. It's:
| The Unicode Character Database is provided as is by Unicode,
| Inc. No claims are made as to fitness for any particular
| purpose. No warranties of any kind are expressed or implied. The
| recipient agrees to determine applicability of information
| provided. If this file has been purchased on magnetic or optical
| media from Unicode, Inc., the sole remedy for any claim will be
| exchange of defective media within 90 days of receipt.
| This disclaimer is applicable for all other data files
| accompanying the Unicode Character Database, some of which have
| been compiled by the Unicode Consortium, and some of which have
| been supplied by other sources.
| Limitations on Rights to Redistribute This Data
| 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 Unicode 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.
| The file Unihan.txt contains older and inconsistent Terms of
| Use. That language is overridden by these terms.
However, many packages that include a copy of parts of the UCD do not
indicate the source (I would expect such a notice in the
debian/copyright file) and are thus violating the license.