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Unlike current DVD technology, the BD-ROM format uses a much stronger encryption algorithm based on 128-bit AES. It features system renewability for key revocation, and incorporates a physical technology for preventing so-called “bit-by-bit” copying to recordable media. Under this scheme, content providers will physically insert a so-called “ROM mark” onto a prerecorded disk during the mastering process. “Our goal is to prevent not only casual copying, but also professional copying, as much as possible,” said Fidler.