I hope this is not a stupid question but...

[Beppe]

...I have downloaded the win32 executable files.
I have looked for the libdvdcss.dll but I did not find it.
Is it linked inside the libDVD*_plugin.dlls?

Or in other words: if I want to watch/listen to a dvd, do I have to download anything else?

[zorglub]

...
Is it linked inside the libDVD*_plugin.dlls?

Yes

Or in other words: if I want to watch/listen to a dvd, do I have to download anything else?

No