Copyright of the generated image via http://www.unicode.org/cgi-bin/refg

As part of an effor to make Encode module successful,  I am writing a 
simple "web typesetter" that renders whole text, not just each character 
via cgi (or mod_perl if the memory is enough).  I would like to use the 
gif-rendered glyphs that are available via 
http://www.unicode.org/cgi-bin/refglyph.
But is the data copyrighted?  If so to whom should I ask?

Dan the Encode Maintainer