Fifty Shades of Grey
Originally an online novelized "fan-fiction" of the "Twilight" series, the novel "Fifty Shades of Grey" by E. L. James loosely explores the relationship between the main characters, had they not remained celibate before marriage. Though the publisher claims the novel is "original and no longer based on "Twilight"", James did not receive copyright authorization to write the novel and some have argued that "Fifty Shades of Grey" may be a copyright infringement. Though Meyer has stated that the novel is "too smutty" and does not interest her, she has not filed a copyright claim.