Did you just find a download or a file on your computer that has been digitally signed by devolo AG? If so, please read on.
You will typically see devolo AG when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screencap shows:

You can view the digital signature details for devolo AG with the following procedure:
Here's a screenshot of a file digitally signed by devolo AG:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This implies that the file has been published by devolo AG and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also view the address for devolo AG, such as the street name, city and country.
VeriSign Class 3 Code Signing 2004 CA and VeriSign Class 3 Code Signing 2010 CA has issued the devolo AG certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the devolo AG files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/49 | npf_devolo.sys |
| 0/62 | npf_devolo.sys |
| 0/45 | kpn-draadloze-verbindingsset-software-4-4-0-5.exe |
| 0/54 | devolonetsvc.exe |
The detection percentage is based on that I've collected 210 scan results for the devolo AG files. 0 of these scan reports came up with some sort of detection. You can review the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: