Terms

The terms of the license are actualy with regard to DISTRIBUTING the software. Therefore if you distribute a product, strictly you must make the source code available yourself.

This is a fine line, but adhering to the letter of the license Skype should have (at least) provided an address for people to write to for a copy of the source code. The reason for a physical address as opposed to a URL is because of the speed at which internet can change. Websites are redesigned at will, and the URLs all change.

It would have been far simpler to include the source on a CD, especialy as it probably came with some form of Driver or Documentation CD anyway. Even if it didnt, costs would be negligible.

And I will also say that if this was Microsoft complaining that a company had used one of their products against the license agreement, most people would have switched sides. For me, a license is a license, and no company should break that unless they are willing to be sued. In this case it appears to be an oversight, but they still violated it. Simple as.