Here's how you can disable Skype ads as well as other annoyances and watermarks.


1) From the main Skype window, click on TOOLS > OPTIONS

2) Click on the PRIVACY TAB, then click on PRIVACY SETTINGS and ensure you have the options as per the illustration below:



3) Not related to ads, but removes all the Skype annoyances and watermarks, click on ADVANCED and remove all the check-marks as illustrated below:



Thanks Matrix Leader for the tip.