• Commons:Licensing
• Wikipedia:Requesting copyright permission

FAC:

• Wikipedia:Wikipedia Signpost/2008-08-11/Dispatches – free images at FAC
• Wikipedia:Wikipedia Signpost/2008-09-22/Dispatches – non-free

• Works for hire
• Copyright tags
• Wikipedia:Image copyright tags/All
• Wikipedia:Donating copyrighted materials

• Copyright law of the United States

• Copyright Act of 1831 [1]
• Copyright Act of 1909
• Copyright Act of 1976
• Cases

• Copyright law revision study, 1960
• Hirtle chart (article by Peter Hirtle)

Public domain:

• Public domain in the United States
• WP:IUP#Public domain: "Wikipedia pages, including non-English language pages, are hosted on a server in the United States, so U.S. law governs whether a Wikipedia image is in the public domain." Images hosted on Wikipedia as public domain have to qualify as {{PD-US}} or {{PD-1923}} unless explicitly released.
• PD in the US