1Letter from Senators Orrin G. Hatch and Patrick Leahy to Marybeth Peters, Register of Copyrights (Jan 5, 2005). 被引量：1
2Copyright Office of the United States ,Orphan Works Comments , online at http://www, copyright, gov/orphan/comments/ index, html (visited Apt 15, 2016). 被引量：1
3Copyright Office of the United States , Orphan Works Reports, online at http://www, copyright, gov/orphan/ (visited Apr 15, 2016). 被引量：1
4Gowers Review of Intellectual Property, online at http://gowers, openrightsgroup, org/ (visited Apr 15, 2016). 被引量：1
