A system and method for capturing annotations for a non-modifiable document is disclosed. Once it is determined that an 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 with the created annotation in...http://www.google.de/patents/US6957233?utm_source=gb-gplus-sharePatent US6957233 - Method and apparatus for capturing and rendering annotations for non-modifiable electronic content
