Applying DRM with FFmpeg: Intertrust DRM
Digital Rights Management (DRM) is a set of access control technologies for restricting the use of proprietary hardware and copyrighted software. It is used to prevent unauthorized redistribution of digital media and to control access to digital media. Intertrust DRM is one of the popular DRM solutions available in the market. In this article, we will learn how to apply DRM to transcoded content using FFmpeg and Intertrust DRM.
What is Intertrust DRM?
Intertrust DRM is a cloud-based digital rights management solution that provides robust security and flexible business models. It enables content owners and distributors to securely distribute and monetize their digital content across various devices, platforms, and distribution channels. Intertrust DRM uses industry-standard encryption technologies, such as AES and RSA, to protect digital content from unauthorized access and piracy.
FFmpeg and DRM
FFmpeg is a popular open-source multimedia framework that can be used for transcoding, streaming, and manipulating various audio and video formats. It also supports DRM technologies, such as Widevine, PlayReady, and FairPlay. However, FFmpeg does not support Intertrust DRM out of the box. To apply Intertrust DRM to transcoded content using FFmpeg, we need to use a third-party plugin or library.
Applying Intertrust DRM to Transcoded Content with FFmpeg
To apply Intertrust DRM to transcoded content with FFmpeg, we can use the ffmpeg-intertrust-plugin library. This library provides a FFmpeg filter that can be used to apply Intertrust DRM to transcoded content.
Installing ffmpeg-intertrust-plugin
To install the ffmpeg-intertrust-plugin library, we need to build it from source. The following steps can be used to build and install the library:
git clone https://github.com/intertrust/ffmpeg-intertrust-plugin.git
cd ffmpeg-intertrust-plugin
autoreconf -i
./configure --prefix=/usr/local
make
sudo make install
Once the library is installed, we can use the intertrust_drm filter in FFmpeg to apply Intertrust DRM to transcoded content.
Using Intertrust DRM Filter
The following example shows how to use the intertrust_drm filter in FFmpeg to apply Intertrust DRM to transcoded content:
ffmpeg -i input.mp4 -c:v libx264 -crf 23 -c:a aac -b:a 128k -vf "intertrust_drm=output_url=https://drmserver.com/license,format=mpd" output.mpd
In the above example, we are transcoding an input MP4 file to an MPD file with H.264 video codec and AAC audio codec. We are also applying Intertrust DRM to the transcoded content using the intertrust_drm filter. The filter takes two options:
output_url: The URL of the DRM license server. The license server generates a license for the transcoded content based on the user's credentials and device information.format: The output format of the transcoded content. In this example, we are generating an MPD file for DASH streaming.
In this article, we learned about Intertrust DRM and how to apply Intertrust DRM to transcoded content using FFmpeg and the ffmpeg-intertrust-plugin library. We covered the key concepts of Intertrust DRM, FFmpeg, and the intertrust_drm filter. We also provided an example of using the intertrust_drm filter in FFmpeg to apply Intertrust DRM to transcoded content.