Q. What am I expected to do with the Windows CE license labels that are included with each shipment I receive from Eurotech?
A. You must permanently affix the label to an accessible location on each finished product. This can be inside a battery cover or any area that can be reasonably accessed by an end user.
These labels are known as COAs (Certificates of Authenticity) and are proof that you have purchased the correct license for your product. The labels specify the version and license model of the CE build (e.g. Windows CE 5.0 Professional).
Source: Microsoft OEM Customer License Agreement for Embedded Systems, version 4.0