Overlaying electronic ink over a document. In some embodiments, a developer may easily define an inking surface over a document, wherein the document may or may not be ink-compatible. The inking surface may act as an input interface such that a user may write onto the inking surface and the ink may be...http://www.google.co.uk/patents/US20030214553?utm_source=gb-gplus-sharePatent US20030214553 - Ink regions in an overlay control
