Defensive disclosure refers to disclosing an invention to the pubilc in order to prevent others from applying for their patents of this invention. This ensures that no one will acquire the exclusive right to this invention, so that every one is provided with some freedom to operate. In defensive disclosure, it must be noted that the disclosure shall be published in the well recoganized technical magazines and publication that are likely to be taken as retrieved referrences by a patent examinator to examine the future patent applications.(Esteban Burrone, http://www.wipo.int/sme/zh/documents/freedom_to_operate.htm)