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Dreamcast's copy protection centres on the use of a proprietary CD-ROM format, which not only increases the amount of data a CD can hold to 1GB, but clearly marks out legitimate Dreamcast CDs from Recordable CD copies. Utopia's code presumably bypasses the console's software that rejects non-Dreamcast CDs. Of course, if the original game is bigger than the 650MB a regular CD can hold, that's a problem. But hackers reckon the solution is just a matter of pruning non-essential files like cut-scene movies.