Selective encryption of mixed raster content layers

摘要: What is disclosed an image path for work flow or printing in which a scanner editor produces raster image. The segmented into background plus plurality of objects represented as foreground, mask pairs (henceforth the pair will be referred to field). Each field possesses potentially different security level. level corresponds public encryption key used encrypt each layer with its corresponding A publicly known file storage and transmission format that supports mixed content store transmit Upon retrieval reception, viewer enters private user interface. can only decrypt authorized.