A system and method for capturing, displaying, and navigating text annotations in a non-modifiable document is disclosed. Once it is determined that a text annotation is to be created, the system determines the file position of the selected object. The file position of the selected object is stored along...http://www.google.com/patents/US7028267?utm_source=gb-gplus-sharePatent US7028267 - Method and apparatus for capturing and rendering text annotations for non-modifiable electronic content
