Info Hyphenation, and more recent Documentation/SL/Using_TeX_hyphenation_patterns_in_OpenOffice.org Using TeX patterns.
TeX patterns License
To integrate the patterns into the OpenOffice.org, they must be released under GNU LGPL v3 license.
The LPPL clearly says that you *can* relicense but you *must* either ship the original file with it or tell the people which file you based on *exactly*. (as written by Rene Engelhard on libreoffice-dev mailing list)