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I got about halfway into my adaptation of a work from the July 1923 Vanity Fair when I realized I couldn't use the period illustrations because they were done by a Belgian guy who died in the 1970s, so they're still under copyright.
My understanding (based on this government document) is that everything published in 1923 or before is now in the public domain, with a maximum copyright duration of 95 years (originally shorter, but with repeated extensions throughout the 20th century). The lifespan of the artist +70 years is only used to determine copyright length on works copyrighted later on.
Is my copyright good in other countries?The United States has copyright relations with most countries throughout the world, and as a result of these agreements, we honor each other's citizens' copyrights.