An optically variable (OVD) or equivalent device, which provides for the same level of
identification and security as currently used in the uniform format for visas, shall be used on the biographical data page and shall take the form of diffractive structures which vary when viewed from different angles (DOVID) incorporated into the hot-seal
ed or an equivalent laminate (as thin as possible) or applied as an OVD overlay, or, on stickers or a non-laminated paper inside page, as metallised or partially de-metallised OVD (with intaglio ov
...[+++]erprinting) or equivalent devices.