Fix an Unauthorised Media error in iBooks Author

If you’ve created a book that contains video files in iBooks Author, you may see an Unauthorised Media error when you try to publish it.

You can follow the steps below to fix the error and publish the book.

1. Quit iBooks Author.

2. Open the Terminal app, then enter

   defaults write com.apple.iBooksAuthor SFDisableSingleFileFormat YES

3. Open iBooks Author.

4. Open the document that showed the Unauthorised Media error when you tried to publish it.

5. Make a minor edit in the document, save the document and then close the document.

6. Reopen the document and try again to publish.