Samsung PN51E490B4FXZA - Manual (Page 147)

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English
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The TV cannot play MP3 files with DRM that have been downloaded
from a for-pay site. Digital Rights Management (DRM) is a technology that
supports the creation, distribution, and management of digital content in
an integrated and comprehensive way, including protecting the rights and
interests of content providers, preventing illegal copying of contents, and
managing billings and settlements.
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A USB device that requires high power (more than 500mA or 5V) may not
be supported.
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If the TV has no input during the time set in Auto Protection Time , the
Screensaver will run.