postings are censored before inserted in the db, and they are also censored on the fly....
theoretically you have to got through all files and delete the censoring before inserting in db. File like private.php, newreply.php, newthread.php, editpost.php, calendar.php aso.
then when there is only an on the fly censoring, it wouldn't be a problem anymore.
If you need help with the last step i can sure help you, but i won't go throug all files to find out the lines where you have to delete the censoring