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This work is now in the public domain in Cambodia because the following condition is met:
It is ineligible for copyright in Cambodia, because it is one of: "Constitution, Law, Royal Decree, Sub-Decree,... other Regulation,... Proclamation (Prakas), decision, certificate, other instructed circulars issued by state organizations." (Art. 10)
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse