CSS key cache collisions

[James Slorach]

I am using the current CVS version of xine with libdvdcss-1.2.6

The CSS key caching mechanism stores keys in directories named after the 
title of the DVD. Unfortunately, this title is not unique - many DVDs use 
generic titles such as 'DVDVOLUME' or 'DVD_VIDEO'. This obviously risks 
collisions in the cache.

I have noticed at least 7 different collisions, where two or more DVDs 
have the same title and attempt to use the same file to cache a key. In 
one case, 8 different DVDs use the same file.

This means that the first DVD will be ok, but subsequent DVDs which 
collide will attempt to use an incorrect key unless the cached key is 
deleted first.

Perhaps the DVD serial number should be used as well as the title? I don't 
know if its uniqueness is guaranteed, but the combination of title and 
serial number should reduce the chance of collision considerably.


James

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