Region Code Enhancement (RCE) tricked multiregion players into inserting an endless loop of a region map into the video an iso copy would contain the loop.Īlso, DVDs don't necessarily fit on the single layer disk people usually copy them onto without further compression. Java bytecode on the disk could look for the discrepancy. ISO files don't copy barcodes in the Burst Cutting Area on the disk. cvlc -run-time 6 -start-time 16 /dev/sr0 vlc://quit I believe ripit4me removes the bits that turn on analog copy protection on the video output. There are 11 additional schemes listed here: For example there are bad sectors that cause trouble if you try to make an iso copy but don't hurt video playback since those sectors are unreachable via menu system and that is one of the easier ones and can be copied with a combination of ddrescue and (optionally) dvdbackup after playing a few seconds of video with vlc or cvlc to unlock CSS. Videos are riddled with multiple types of copy protection, in addition to Content Scrambling System. Bit for bit copy doesn't work for most commercial DVD videos.

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