CSS key cache collisions

[James Slorach]

On Mon, 24 Mar 2003, Michael Roitzsch wrote:

> Hi James, Hi libdvdcss team,
> 
> I have looked through my DVD archive and have also found discs with the 
> same disc title, although I could not trigger any clash here. 
> Especially TV series with multiple DVDs per season can suffer from 
> this. (I am talking about the Star Trek TNG box sets.)
> 
> Attached is a patch which includes the serial number into the directory 
> name. I don't know if this is guaranteed to be safe, but it works 
> nicely here. The patch also fixes an issue when the key cache is used 
> together with raw devices: The raw reading has to be enabled after 
> extracting the disc title and serial, because otherwise the reads will 
> fail due to the target buffers not being properly aligned in memory.
> 
> If James can confirm that this fixes the clashes, I would be glad if 
> this could make it into cvs. Thanks.

I have applied the patch to libdvdcss-1.2.6

Actually, it uses the date instead of the serial number. For example:

libdvdcss debug: using CSS key cache dir: 
/home/jrs47/.dvdcss//DVD_VIDEO#2000041918251900/
libdvdnav: DVD Title: DVD_VIDEO
libdvdnav: DVD Serial Number: 28939329
libdvdnav: DVD Title (Alternative): 

The clashes no longer occur.


I haven't tested the raw device stuff.

James

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