In 2008 Lochaber High School in Fort William, Scotland performed an unauthorized adaptation of Carrie.

The film is an unauthorized "loose" adaptation of J. D. Salinger's 1961 book Franny and Zooey.

After their unauthorized adaptation of one of Ray Bradbury's stories in another magazine, Bradbury contacted EC about their plagiarism of his work.

An unauthorized adaptation of Ray Bradbury in another one of EC's comics.

The first vampire-themed movie was made during this time: F. W. Murnau's Nosferatu (1922), an unauthorized adaptation of Bram Stoker's Dracula.

Nosferatu (1922), for example, was an unauthorized adaptation of Bram Stoker's Dracula.

An earlier, apparently unauthorized adaptation called Nightmare Angel was filmed in 1986 by Susan Emerling and Zoe Beloff.

"Nosferatu," F. W. Murnau's unauthorized 1922 adaptation of the Stoker novel, is a silent-screen classic, but it is seen by many to be anti-Semitic.

(An earlier, unauthorized adaptation of Star Fleet Battles as a computer game was SSI's The Warp Factor in 1982.)

A memo to Rand dated May 4, 1964, mentions the unauthorized adaptation, but there is no indication that she took any legal action.