The state of a label at an optional time point, such as a past time point, can be recognized, while the label can be regenerated even when the label has been deleted. When a label on which can be pasted an object, such as text, picture or sound, is acted upon (yes at step S141) the difference of the...http://www.google.de/patents/US8127218?utm_source=gb-gplus-sharePatent US8127218 - Information processing method and apparatus
