User blog comment:KrystalLBX/Tiger Journey: Episode 1 "Dragoacademy"/@comment-24737876-20140630111117/@comment-6204429-20140630115001

As defined over here, plagiarism is when a writer deliberately uses someone else's language, ideas, or other original material without acknowledging its source. As fanfiction, writers always recognize the original source as the writing is meant to pay tribute to that source, therefore it isn't plagiarism.

Also, people very rarely get arrested for plagiarism, they receive other forms of punishment monetary repercussions or loss of jobs/reputational decline. Jail time would only be seen under extremely serious circumstances.