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There is a long history of producers creating tie-in material to promote and merchandise movies and television shows.

Tie-in materials as far-ranging as toys, games, lunch boxes, clothing and so on have all been created and in some cases generate as much or more revenue as the original programming.

One big merchandising arena is publishing.

In most cases such material is not considered canon within the show's mythology ; however, in some instances the books, magazines, etc.

are specifically designed by the creators to be canonical.

With the rise of the Internet, in-canon online material has become more prominent.