Downloaded content from Netflix is not perpetually available for offline viewing. The availability period for downloaded movies and shows is subject to expiration. These expirations are in place due to licensing agreements between Netflix and the content providers. Once downloaded, the title has a defined window during which it can be watched offline.
The practice of time-limiting access to downloaded content is essential for maintaining the contractual obligations Netflix has with studios and production companies. These agreements dictate the terms under which content is distributed and viewed. Allowing indefinite offline access would violate these licensing agreements. Expiration parameters provide a safeguard that respects the rights of content creators and distributors.