Adobe® Photoshop® Tutorials > Copyright Symbol within Text (Includes Character Map Description for Windows)
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To insert a copyright symbol © within a text type, hold down the Alt key, and key in the numbers 0169.
To further expand on this subject, an easy way to find special characters and their respective keystroke is to look in the Character Map (Windows). To view the character map (see picture below), choose Start > All Programs > Accessories > System Tools > Character Map.