This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
1. it was subject to Crown copyright and was first published more than 50 years ago, or
it was not subject to Crown copyright, and
2. it is a photograph that was created prior to January 1, 1949, or
3. the creator died prior to January 1, 1972.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.
This work is in the public domain in the United States because it meets three requirements:
it was first published outside the United States (and not published in the U.S. within 30 days),
it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country (Canada) on the URAA date (1 January 1996).
For background information, see the explanations on Non-U.S. copyrights. Image was public domain prior to the URAA date
LAC indicates copyright expired and restrictions on use: NIL
Captions
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{{Information |Description={{en|D.H. 4 aircraft G-CYDM of the Canadian Air Board, High River, Alberta, Canada., 4 November 1922.}} |Source={{LAC|1967-052 NPC|3643537}} |Author=Credit: Government of Canada |Date=November 4, 1922 |Permission={{PD-Canada}}{{PD-1996|Canada|January 1, 1996|Image was public domain prior to the URAA date}} LAC indicates copyright expired and restrictions on use: NIL |other_versions= }} Category:Airco DH.4Category:Aviation in Alberta [[Category:1922 in Albe...
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