Cd-key is important for Starcraft players because you can’t even play the game anymore or even you borrow a friend’s one you still can not play online. So follow these steps to get back your own and regain the full gaming experience.
Open a web browser and visit www.blizzard.com then click Support.
Click on the StarCraft logo among the list of Blizzard games.
Click on CD-Key Issues under the Technical Support headline.
Select the issue you have from the list to the right and follow the directions on the new page.