It does look like WD may have a bit of an issue with this, as people will not buy their drives.
However, I thought that the MioNET service that WD packages with the networked drives (supposed to make it easy to share files over the net) is what stops file sharing (legal or not).
This software is NOT mandatory and samba shares can be used.
How to not use WD software
But, if you bought it for letting you view/share video with WD Anywhere Access, then, yep your screwed.
Tim