> 1) dirt (rented DVDs pass through a lot of hands)
> 

cleaned with special stuff - if doze can get the data then linux should
be able to too.

> 2) new encryption that libdvdcss cannot handle. After all, that
> regstered encoding copy-protection business that the media providers
> have been pushing/implementing (I don't follow RIAA/MPAA news that
> closely) is certainly more likely to be on DVDs available for rental,
> since "they" know that it's a source to rip DVDs. So that's where I'd
> put it if I thought it was important to make it (meaning on DVDs
> destined for rental outlets).

possible, but highly unlikely. One of the dvds was quite old and I have
successfully played/ripped dvds of that vintage. Plus it would make
older dvd players no longer work.

> 
> Plus, you *played* it under PowerDVD, but you didn't try to *rip* it
> under Windows-- I suspect that it wouldn't work there either, and that
> PowerDVD and other Windows players have the facility to bypass the copy
> protection for reading, but that the DVD itself is "copy-proofed"
> against both Windows and Linux tools.

hmmm. If the player can get the stream then so can I. The problem is
that neither mplayer nor xinelibs can get the stream. It very much
appears to be a dvdread or dvdcss problem but you never know. They are
just encrypted files, and the decryption software in powerdvd or
libdvdcss should be able to decode it.

> 
> Clearly some of them are-- I just read (not a week or two ago) about a
> French claimant who won (!!) a case claiming that DVD copy protection
> violated his privacy rights (he was trying to copy a DVD to a video
> tape-- the story is at http://www.foxnews.com/story/0,2933,154663,00.html ).
> 

And guess where I live! Apparently there was some talk of encrypted dvds
no longer legally being able to be distributed here. There is a law that
says that once an author has distributed a work they must allow copy for
private personal use. That means that if I rent a dvd I am *legally*
allowed to copy it! Or that seems to be how the courts have interpreted
it. Certainly no redistribution allowed, but copy for personal use seems
to be OK.
Cheers
Antoine
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