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You may have to research your specific term to see how far back it goes and if you can find the first or earliest instance(s). Depending on what you're looking for, you may have to go to physical l...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/17352 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/17352 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You may have to research your specific term to see how far back it goes and if you can find the first or earliest instance(s). Depending on what you're looking for, you may have to go to physical libraries rather than just the Internet. Star Trek is obviously a TV show, so the origin can be easily pinpointed. Most of the proper names on the show you can also consider copyrighted. Planet names may or may not; you'd have to look them up. Elves, dwarves, et al. are mythology, but Tolkien's specific interpretation and history of his Middle-Earth elves are copyrighted. As far as published works in general, in the U.S. the rule of thumb is 75 years after first publication, but some authors/estates renew this copyright, so it's not an ironclad rule. As an example, any Sherlock Holmes stories written before 1923 are public domain (not copyrighted) but those after 1923 are not.