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The Apple TV+ subscription offers access to Apple Originals. Content from other producers, such as Disney, is not part of that subscription, and will have to be paid for separately. Whenever you see Buy or Rent in the Apple TV app, then that is from the iTunes Store.

List of Apple TV+ original programming (episodic content) - Wikipedia

List of Apple TV+ original films - Wikipedia

About Apple TV+ - Apple

Apple Originals - Apple TV+ Press

Buy movies and TV shows from the Apple TV app - Apple Support

Rent movies from the Apple TV app - Apple Support

Use the tv+ tab to filter for just Apple TV+ content.

The subscription price you paid is specifically for Apple TV Plus, as explained above you can use the tab to filter just the content included with that service. The app also houses a digital marketplace to purchase or rent specific titles or subscribe to other services. Similarly Amazon has an app that houses their subscription service, along with other channel add-ons and a marketplace. For streaming Disney owns the rights to that title and includes it with their Disney Plus service.