Is the yellow brick road copyrighted?

Yes, the concept of the Yellow Brick Road from L. Frank Baum's "The Wonderful Wizard of Oz," published in 1900, is protected by copyright. However, since the original work was published over 100 years ago, it has entered the public domain, meaning that the specific text and imagery associated with it can be freely used. Adaptations, interpretations, and specific representations may still have their own copyrights, depending on how they are created.