As always, do not trust others until you have confirmed it is secure. I have never simply trusted something and including Skype. Legal intercept is simply a good excuse. It's the same as key escrows and we have already known from history, it's easier to have a backdoor than to try and fight a protocol itself. Another new item to distrust completely, Skype. Because it's closed sourced, it's a walled garden and now the owner wants to add eavesdropping for "legal" uses. Who knows which employee would have some fun sitting behind their desktops and making jokes on intercepted Skype conversations and posting funny calls on the Youtube for all to have fun and merry ?