Libdvdcss is a free software library designed to facilitate the decryption of DVDs that are encrypted with the Content Scramble System (CSS), which is a form of digital rights management (DRM) used to protect commercial DVDs. The primary purpose of libdvdcss is to enable users to play DVDs that would otherwise be inaccessible due to encryption. It allows media players and software applications to access the content of these DVDs without the need for specialized hardware or proprietary software.
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