i'm using AnyDVD 5.6.3.1 with DVD Decrypter 3.5.4.0. The problem is that the movie is copied to HD but there is no audio. This happened with several DVDs (Moulin Rouge, Planet Of The Apes). Can anyone tell me what's the problem

Are you playing it on your computer? What player program?

Or are you playing it in a standalone player?

i'm playing it on my pc with PowerDVD 6

maybe you need dts & ac3 codec...try to look on google

Audio issues have been a problem with older versions of 1click, anyDVD.. and I beleive some other programs. Try updating to the latest versions (you are current on AnyDVD) and see what happens.

well i have latest versions. i forgot to mention that i have K-Lite Mega Codec Pack 1.45 installed. Dont know this happens only with protected DVDs

Let me just say this: codec packs SUCK!!! They install a large number of codecs of questionable quality, often with many redundant codecs. If you really want to do things right, start by uninstalling any existing codec packs, and go to this site: http://www.inmatrix.com/zplayer/formats/
Go through and download one codec for each listed media type (unless you really don't need/want it. Some of the listed formats are very obscure), and install each one manually. This takes longer, but it ensures there are no conflicts, and that you have the best possible codecs available. This info comes from ZoomPlayer, which, btw, is my DVD (and media file) player of choice. If you download ZoomPlayer (there's a trial version available), it will show you what codecs you're missing for what format, and give a link to download the correct codec. Also, if you have multiple codecs for a single format, it will show you their priority (which one the system will use first). Very handy.

I'm not sure if that will resolve your problem, however. Since it's only happening on protected discs, it sounds more like a problem with AnyDVD itself. If the codecs don't resolve the issue, try simply uninstalling and reinstalling AnyDVD.