| 摘要 |
A transparent film 10 has translucent markings 18 printed on it at well-spaced positions. The film has a pressure sensitive adhesive on the same face as said markings so that it may be stuck over information presented on a sheet of paper e.g. a photograph 22 in a passport, to prevent that information being tampered with. The pressure sensitive adhesive used, is chosen so that attempted removal of the film leads to irreparable damage to either the substrate or the film itself, or both. <IMAGE> |
