property enforcement


git-svn-id: https://gnunet.org/svn/gnunet@32300 140774ce-b5e7-0310-ab8b-a85725594a96
trying to fix #3281

git-svn-id: https://gnunet.org/svn/gnunet@32307 140774ce-b5e7-0310-ab8b-a85725594a96