The operating principle permits a reader of an electronically published document to create notes, bookmarks, or annotations and relate them to a particular location in the document. The record of such annotations or "place marks" can be stored within or separately from the published material. Annotations...http://www.google.fr/patents/US5146552?utm_source=gb-gplus-shareBrevet US5146552 - Method for associating annotation with electronically published material
Method for associating annotation with electronically published material
