Copyright law protects original expressions of ideas, including the dialogue in films. While short phrases might fall under fair use, substantial portions of dialogue or iconic lines are generally considered intellectual property of the copyright holder, often the film studio. For instance, using a character’s catchphrase on merchandise without permission could constitute infringement.
Protecting cinematic dialogue ensures creators and studios retain control over their work, preserving its artistic integrity and potential revenue streams. This protection encourages further creative endeavors and allows copyright holders to license memorable lines for various uses, benefiting both the rights holders and those seeking to use the material legally. Historically, as the film industry grew, so did the need to protect its creative output, leading to more robust copyright laws covering scripts and dialogue.