The Adobe Photoshop CS2 serial number is used to unlock the full functionality of the software. Without a valid serial number, most of the software tools included in the Adobe Photoshop CS2 package are rendered completely inoperable.
If Adobe Photoshop CS2 is purchased new off the shelf from a retail store, a valid serial number is typically included along with the CD or DVD media and associated documentation. If Adobe Photoshop CS2 is purchased online and downloaded to the computer, a valid serial number is typically sent to the buyer in an email message along with the purchase invoice.
Adobe Photoshop CS2 was released in May 2005. This version of the software has since been superseded by five newer versions. As of June 2013, the current version of the software is Photoshop CC.