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I am not a lawyer. This is based on my understanding of U.S. copyright laws. Any part of B's story which is unique to B is, I believe, the property of B. So if B is writing an X-Files fanfic about...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/12230 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/12230 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
_I am not a lawyer. This is based on my understanding of U.S. copyright laws._ Any part of B's story which is unique to B is, I believe, the property of B. So if B is writing an _X-Files_ fanfic about Mulder, Scully, and an original character who is a female agent for the Canadian Security Intelligence Service, and C writes a parody-bordering-on-plagiarism about Mulder, Scully, and Jack St. Georgina, then B probably has legs to go after C if the story, "Wyverns of the Heart," significantly lifts text from B's work. If C's story is merely parody, then it falls under the same Fair Use rules as any other parody. I believe that since the original character is an invention of B, B actually does have the copyright to that character, and B does have the copyright to the original story, plot, and text. So there might be grounds for a plagiarism claim. Since B's work is "transformative" of A's copyrighted work, I think B would be hard-pressed to find a lawyer willing to take the case on. But the possibility exists. You are _probably_ right in that you can't be sued. However, I do wonder why you're expending so much energy trolling these people.