You are free to distribute and sell OpenOffice.org. The only legal provision is that users should be kept aware of the location of the source of the executable binaries distributed. That is, all users should be informed that the source can be found on http://www.openoffice.org/. Of course, we also ask that you support the project that makes this possible.
"OpenOffice.org is a fully-featured open-source office productivity suite available as a free, extensible download for major platforms in over 90 languages. It is compatible with competing office suites. OpenOffice.org is developed, supported, and promoted by an international community operating from the http://www.openoffice.org/ website. OpenOffice.org stores data in the open XML file format adopted by the international standards body OASIS as the OpenDocument Format (ODF) and approved by the ISO as ISO/IEC 26300:2006."