don't say a word,is it protected??

just got a rental copy of "don't say a word" its dvd5 but when i rip it to my drive with dvd decrypter or smart ripper the first vob file has no audio?,i've tried it on 2 machines with same results,it plays fine on power dvd and stand alone,is this a new protection? or just freaky,the film is r2 uk pal
 
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