To give some more details on what Hiroshi wrote, what happened (actually upstreams, not at Ruby itself) is that somebody took some of the Unicode data files and used them to produce a product supporting Unicode, as permitted in the copyright for those files.
The resulting files bear some similarity to the original ones, but that similarity is limited to using 0xABCD notation and the "one line per entry" convention (stuff used widely throughout the community), and containing the same mappings (which is explicitly what's needed to "produce a product supporting Unicode"). The number of columns and the order of columns and entries has been changed. Some new headers have been added.
Whoever did this work kept all the explanatory text and the copyright notice, but the explanatory text does no longer apply (it's explicitly wrong). Once that's gone, the copyright notice is also no longer necessary, because the result is not a copy of the original file, but use of the data in the original file which is explicitly permitted.
I'm therefore going to replace these copyright notices with a very short notice explaining the above facts. This short notice will also say that Unicode, Inc. never made any claims as to fitness of that file for any particular purpose, and has ceased to publish the file many years ago. I'm doing that because in discussions with people at the Unicode consortium, it turned out that the main reason they don't want to republish these old files with a new copyright (as they have done for other files) is that they are afraid to give any impression of "correctness" for these files.
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