I have heard and read many rumors about Skype but very few tangible informations. Skype is said to be engaged in censorship in China according to the official Ubuntu Wiki, and to have very serious security threats according to French Defense classified information files. Therefore, although it is widely used in companies, Skype is forbidden in universities.
What is the part of trueness of those statements? In the end, am I exposed to security threats if use Skype?