Instructions
Open the box your "Starcraft" game came in, and remove the game's CD case.
Flip the game's CD case over and look for a sticker that has a 26-digit code printed on. This 26-digit code is the game's CD key.
Open the game's CD case and remove the game's manual if you were unable to find the CD key on the back of the CD case. Look for the sticker that contains the 26-digit code on the front and back of the game's manual. These three locations (back of the CD case, front of the game manual and back of the game manual) are the three locations Blizzard places its CD key stickers.