9. A method for annotating a content data stream, the method comprising: receiving, by a processor, a content data stream; annotating, by a processor, content of the content data stream with metadata that symbolically describes information present in the content; outputting, by a processor, the content of the content data stream in a modality that is directly perceptible by an individual; and processing, by a processor, the annotated content to output a metadata stream in synchronization with the output content data stream, wherein the metadata data stream is output in a form that is not directly perceptible by an individual, but can be detected and processed using a personal annotation output device to output non-textual annotations in a modality requested for the interpretation or cognition of the annotated content, wherein the requested modality is specified by a receiver of the outputted content data stream, wherein annotating the content of the content data stream with metadata that symbolically describes information present in the content further comprises: identifying a segment of the content, wherein the content is an audio/visual data stream; identifying a region of the segment to be annotated, wherein the region is a portion of an image of the segment; and annotating the region of the segment of the content data stream with metadata that symbolically represents emotional informational content of the region, wherein the metadata is associated with the region and is not associated with another portion of the image of the segment.
11. The method of claim 9 , further comprising transmitting a request for personalized metadata for the content data stream, which can be rendered for a target modality to non-textually annotate the content data stream.