Drm Video Downloader For Android

Posted : admin On 15.12.2020
Drm Video Downloader For Android 3,1/5 4179 votes
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.THIS IS A DEVELOPER TOOL ONLY.If you have problem with your media app, contact that app's support. This app will display the information of the Digital Right Management (DRM) module from Android Media Framework and MediaDrm API. This app only shows the info, and is not doing any test on the availability. Popular media apps (e.g. Netflix, Disney+) rely on DRM (e.g. Widevine / PlayReady). Download DRM Video apk 1.0.3 for Android. DRM is an lecture recording system. Oct 29, 2019 The default download folder is 'My Barnes & Noble eBooks' in library. Step 3: Install and launch Nook DRM Removal. The tool will automatically detect Nook books on your computer and upload them. Then just drag the books to the main interface of this program and click 'Remove DRM' button to open output folder. Download Nook DRM Removal for Windows. There maybe two possible situations. One is that the DRM video provides you download service, the other is the opposite. Case one: In this situation, there is a hyperlink for you to directly download DRM video from the website. Below are the detailed steps. Open the site with the DRM video you want in your web browser.

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This document provides an overview of the Android digital rights management (DRM) framework andintroduces the interfaces that a DRM plugin must implement. This document doesn'tdescribe robustness rules or compliance rules that may be defined by a DRMscheme.

Framework

The Android platform provides an extensible DRM framework that letsapps manage rights-protected content according to the licenseconstraints associated with the content. The DRM framework supports many DRMschemes; which DRM schemes a device supports is up to the device manufacturer.The DRM framework provides a unified interface for application developers andhides the complexity of DRM operations. The DRM framework provides a consistentoperation mode for protected and nonprotected content. DRM schemes can definecomplex usage models by license metadata. The DRM framework provides theassociation between DRM content and license, and handles the rights management.This enables the media player to be abstracted from DRM-protected ornonprotected content. See MediaDrmfor the class to obtain keys for decrypting protected media streams.

Figure 1a. DRM hardware abstractionLayer before Android 11
Figure 1b. DRM hardware abstractionLayer starting in Android 11

The availability of rich digital content is important to users on mobile devices. Tomake their content widely available, Android developers and digital contentpublishers need a consistent DRM implementation supported across the Androidecosystem. To make that digital content available on Android devices and toensure that there's at least one consistent DRM available across all devices, Google providesDRM without license fees on compatible Android devices. The DRM plugin isintegrated with the Android DRM framework and can use hardware-backed protectionto secure premium content and user credentials.

The content protection provided by the DRM plugin depends on the security andcontent protection capabilities of the underlying hardware platform. Thehardware capabilities of the device should include hardware secure boot toestablish a chain of trust of security and protection of cryptographic keys.Content protection capabilities of the device should include protection ofdecrypted frames in the device and content protection through a trusted outputprotection mechanism. Not all hardware platforms support all of the abovesecurity and content protection features. Security is never implemented in asingle place in the stack, but instead relies on the integration of hardware,software, and services. The combination of hardware security functions, atrusted boot mechanism, and an isolated secure OS for handling securityfunctions is critical to providing a secure device.

Architecture

The DRM framework is designed to be implementation agnostic andabstracts the details of the specific DRM scheme implementation in ascheme-specific DRM plugin. The DRM framework includes simple APIs to handlecomplex DRM operations, acquire licenses, provision the device,associate DRM content and its license, and finally decrypt DRM content.

The Android DRM framework is implemented in two architectural layers:

  • A DRM framework API, which is exposed to apps through the Android application framework.
  • A native code DRM framework, which exposes an interface for DRM plugins (agents) to handle rights management and decryption for various DRM schemes.
Figure 2a. DRM framework before Android 11
Figure 2b. DRM framework starting in Android 11

See AndroidMedia DRM andAndroid Media Crypto for more details.

DRM Plugins

At system startup, the DRM framework scans for HAL instances/services (described in .rc files)and plugins are discovered through the HIDL registry. Media DRM Server(mediadrmserver) creates both CryptoHal and DrmHal objects.CryptoHal and DrmHal then call the plugins with vendor-specific implementations.

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Plugins should implement binderized HALs. Binderized HALs use theHAL interface definition language (HIDL),which allows the framework to be replaced without having to rebuild HALs.

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Plugins are built by vendors or SOC makers and put in a /vendor partition onthe device. All devices launching with Android 8.0 or higher must support binderized HALs writtenin the HIDL language.

Implementation

To implement new DRM frameworks APIs by a plugin:

  1. Add plugin service to the device’s build files.
  2. Update the device manifest.
  3. Add SELinux permissions.
  4. Create a .rc file under /vendor.
  5. Implement the plugin.

APIs are defined in each version of IDrmPlugin.hal, ICryptoPlugin.hal, IDrmFactory.hal, and ICryptoFactory.hal

Adding plugin service to device build files

For example, to add interface 1.3 support, the VENDOR DEVICE/device.mk file must include the android.hardware.drm@1.3-service.* packages:

Versions 1.0 to 1.2 are deprecated in R / Android 11. Devices upgrading to R are still allowed to run versions 1.0 to 1.2. However, new devices launching with R must run only version1.3.

Updating the device manifest

The vendor manifest.xml file for the device must include the following entries:

Alternately, we recommend using vintf_fragments.

Adding SELinux permissions

  1. Add to VENDOR DEVICE/sepolicy/vendor/file.te
  2. Add to VENDOR DEVICE/sepolicy/vendor/file_contexts

    We recommend using regular expressions to specify the version numbers to avoid making updates for new releases, for example:

    Alternately, update the version numbers as shown below.

  3. Add to device/sepolicy/vendor/hal_drm_clearkey.te

Creating an .rc file under /vendor

The .rc file specifies the actions to be taken when a service is launched.

See Android Init Language for details.

Implementing the plugin

  1. Implement the main() entry point in service.cpp of the pluginservice.
  2. Implement ICryptoPlugin, IDrmPlugin, ICryptoFactory, and IDrmFactory.
  3. Implement the new APIs in the plugin.

DRM plugin details

DRM plugin vendors implement DrmFactory, CryptoFactory, andDRM plugin.

DrmFactory

The DrmHal class searches for registered DRM plugin services and constructscorresponding plugins that support a given crypto scheme through the DrmFactoryclass.

IDrmFactory is the main entry point for interacting with a vendor's drm HAL through the createPlugin API. The createPlugin API is used to create IDrmPlugin instances. The 1.3 IDrmFactory must always create 1.2 IDrmPlugin interfaces, which are returned via the 1.0 createPlugin method.

New in 1.3 IDrmFactory, getSupportedCryptoSchemes returns a list of supported crypto schemes for the HIDL drm HAL instance.

Determines if the plugin factory is able to construct DRM plugins that support a given crypto scheme, which is specified by a UUID.

Determines if the plugin factory is able to construct DRM plugins that support agiven media container format specified by mimeType.

Constructs a DRM plugin for the crypto scheme specified by UUID.

CryptoFactory

The CryptoHal class searches for registered DRM plugin services and constructscorresponding plugins that support a given crypto scheme through the CryptoFactoryclass.

Determines if the crypto factory is able to construct crypto plugins that support a given crypto scheme, which is specified by a UUID.

Determines if the plugin factory is able to construct crypto plugins that support a given crypto scheme, which is specified by a UUID.

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DRM plugin

The APIs are defined in hardware/interfaces/drm/VERSION/IDrmPlugin.hal. The corresponding IDrmPlugin.h

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file can be found inout/Soong after the build.