That looks mighty dodgy...
According to the FAQ at http://symphony.lotus.com/software/lotus/symphony/help.nsf/GeneralFAQ , "Lotus Symphony is based on the open source OpenOffice.org code".
OpenOffice.org is distributed under the LGPL; the LGPL makes certain requirements of any redistributors - largely along the lines of the GPL, but it also permits redistributors to ship LGPL code with proprietary code, so long as the LGPL portion remains a separate library under the LGPL licence.
So far, so good. Except that if you try to download Symphony from the IBM download site at https://www14.software.ibm.com/webapp/iwm/web/pick.do?source=swg-normandy&S_PKG=linux&S_TACT=104CBW71&lang=en_US , it requires you to sign up to IBM's International License Agreement for Non-Warranted Programs - http://www14.software.ibm.com/cgi-bin/weblap/lap.pl?la_formnum=&li_formnum=L-HKAG-8758BY&title=Lotus+Symphony+3.0&l=en .
This has some very interesting phrases in it such as "the backup copy does not execute unless the backed-up Program cannot execute", "Licensee ensures that anyone who uses the Program ...) does so only on Licensee's behalf", and "Licensee does not ... sublicense, rent, or lease the Program".
It also says "This Agreement ... is the complete agreement between Licensee and IBM regarding the use of the Program".
This looks remarkably like a LGPL violation. That's impressive - the LGPL is one of the easiest licences around in terms of compliance, but at first sight. IBM seem to be doing the dirty on this one...