It is a cinematographic work, photographic work, work of applied art or anonymous work first published more than 75 years ago. (See Commons:Copyright rules by territory/Vietnam)
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It is another type of work, and the creator died more than 50 years ago.
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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.
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share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Legal disclaimer This image contains a symbol prohibited by law in some nations, owing to it being a representation of communism, socialism, or a similar governmental structure; or of an associated political party/organization: