They are used for digital rights management framework libraries used by HAL in android. They should be implementing the industry standard for encryption to video music streams. I do not believe the default media player calls them since it does not play DRM streams. Something like Netflix player I am sure does. also next player works with http://www.verimatrix.com/es/blog-tags/drm to encrypt the video and then decrypt it on the client android using these libraries.
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