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Why use CSS?
 Piracy StatsOnce you've employed CSS, you will be ready to review Dub-It's DVD-5 and/or -9 Replication Services.
Using CSS, each video title set (VTS) is selectively scrambled using a unique key. Each title is assigned a unique key, and this information is stored on the disc in encrypted form.
In the decoder, the orginal keys are obtained by decryption; they are used to descramble the data. Only the video data is encrypted. For DVD-ROM drives, the MPEG-2 decoder gleans the necessary keys for decryption, ensuring that only approved hardware/software can be used.
The actual scrambling is typically carried out during glass mastering.
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