In an information processor for checking in or out a content to an external device connected thereto, a number of possible checkouts for the content by a predetermined kind of symbol, a name corresponding to the content is displayed and a number of possible checkouts for the content is displayed. Thus,...http://www.google.com/patents/US7512549?utm_source=gb-gplus-sharePatent US7512549 - Information processor and processing method, and information storage medium
