In order to create a derivative work, you need to get permission from the copyright holder if the story is not in the public domain.

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This is because creating a derivative work involves building upon an existing work, which is protected under copyright law. Without permission from the copyright holder, creating a derivative work would be a violation of their rights. However, if the original work is in the public domain, it is free for anyone to use and build upon without needing permission.

In Order to Create a Derivative Work, You Need to Get