The Gamespy SDK used for online cd-keys validation in third party code has various vulnerabilities. Game servers getting crashed and privacy problems persist. Gamespy themselves sent the author a cease and desist due to his research.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/32764/GamespySDK.txt
Source: https://packetstormsecurity.com/files/32764/GamespySDK.txt.html