How does copyright enforcement technology work? — Video DVD Forum — DVD MP3 AVI MP4 players codecs conversion help

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I've seen lots of posts about how to copy copyrighted DVDs. I tried naively
copying the contents of several copyrighted DVDs using dd under Linux. The
copy invariably failed after a small number of bytes. I'm curious to know
how the copyright enforcement technology causes a low-level copy of this
sort to fail. Can anyone shed light on this? Thanks

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Gary Roach
ADB Services