Methods and apparatus for making an optically encoded medium incapable of being read and resistant to abuse

摘要

Methods and apparatus for making an optically encoded medium incapable of being read and resistant to abuse. Methods and apparatus are provided to make a media which can be read optically incapable of being read and resistant to violations.It is shown a method for making a media which can be read optically incapable of being read, because it is a media that operates according to the method.The method has the steps of: (a) the provision of media with a surface layer of reading that is not flat (i.e., textured, in some way, such as by recording, scratch,The deposition of a layer non flat or regions, such as the droplets), and which prevents an optical reading of the media; (b) application of a coating layer to the surface layer non flat,To smooth out the surface flat and allow an optical reading of the media; and, after a beginning of a period of reading, (c) removal of the coating layer.In order to expose the surface layer of reading is not flat, thereby preventing the optical reading of the media.Preferably, the coating layer is substantially index combined with the surface layer of reading.In one method, the step of removal includes a step of evaporation of at least a material component of the coating layer, while in another mode.The removal step includes a step of sublimation of at least one material component of the coating layer.It is also shown a method for discouraging a violation, with a mechanism to limit reading a media which can be read optically.Since it is a media constructed to operate in accordance with the method.In this method, the method has the steps of: (a) the provision of media with at least one layer, which carries out the mechanism of limitation of reading; (b) provision of a textured surface.They form part of a layer located below the at least one layer.Where the textured surface prevents an optical reading of the media; and (c) applying a coating layer on the textured surface.To smooth the textured surface and to allow an optical reading of the media, where the removal of the coating layer exposes the textured surface.In this way, preventing an optical reading of the media.The disc may be packaged in a sealed container with a source of an agent that inhibits transport of volatile species from the layer of colour formation or a layer which sublimates.Where the start of the implementation period limited coincides with the opening of the container.