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Note: Much TEE literature covers this topic under the definition "premium content protection" which is the preferred nomenclature of many copyright holders. Premium content protection is a specific use case of Digital Rights Management (DRM), and is controversial among some communities, such as the [[Free Software Foundation]].<ref>{{Cite web | title = Digital Restrictions Management and Treacherous Computing Free Software Foundation working together for free software | access-date = 2019-08-20 | url = https://www.fsf.org/campaigns/drm.html | archive-date = 2018-07-05 | archive-url = https://web.archive.org/web/20180705233004/https://www.fsf.org/campaigns/drm.html | url-status = live }}</ref> It is widely used by copyrights holders to restrict the ways in which end users can consume content such as 4K high definition films.
The TEE is a suitable environment for protecting digitally encoded information (for example, HD films or audio) on connected devices such as smart phones, tablets and HD televisions. This suitability comes from the ability of the TEE to deprive the owner of the device from reading stored secrets, and the fact that there is often a protected hardware path between the TEE and the display and/or subsystems on devices.
The TEE is used to protect the content once it is on the device: while the content is protected during transmission or streaming by the use of encryption, the TEE protects the content once it has been decrypted on the device by ensuring that decrypted content is not exposed to the environment not approved by the app developer or platform vendor.
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