Did you just stumble upon a file that has been digitally signed by GfK SE? If that's the case, please read on.
You will typically see GfK SE when clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the GfK SE certificate with the following steps:
Here is a screenshot of a file signed by GfK SE:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This means that the file has been published by GfK SE and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also view the address for GfK SE, such as the street name, city and country.
COMODO Code Signing CA 2, UTN-USERFirst-Object and COMODO RSA Code Signing CA has issued the GfK SE certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the GfK SE files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/49 | GfKLSPService.DLL |
| 0/42 | GfKLSPService64.DLL |
| 0/57 | GfKLSPService64.DLL |
| 0/41 | GfKLSPService64.DLL |
| 0/47 | GfKLSPService64.DLL |
| 0/48 | GfKLSPService64.DLL |
The detection percentage is based on the fact that I've gathered 284 scan reports for the GfK SE files. 0 of these scan results came up with some sort of detection. If you like, you can view the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: