This stands for Dolby Digital Plus 5.1 . This is the audio format. The "5.1" means it supports surround sound (five speakers and one subwoofer), providing a cinematic audio experience.
This is the video compression codec (also known as AVC). It is the most common format for HD video because it balances high visual quality with manageable file sizes.
This is the "tag" of the release group—the people who ripped and uploaded the file. In the world of digital media, groups like ENIAHD add their signature to the end of the file name.
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