Did you just find a file that is digitally signed by Open Source Developer, Birunthan Mohanathas? If so, please read on.
You'll probably notice Open Source Developer, Birunthan Mohanathas when double-clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the Open Source Developer, Birunthan Mohanathas digital signature with the following procedure:
Here's a screenshot of a file signed by Open Source Developer, Birunthan Mohanathas:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This implies that the file has been published by Open Source Developer, Birunthan Mohanathas and that the file has not been tampered with.
If you click the View Certificate button shown in the screencap 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 examine the address for Open Source Developer, Birunthan Mohanathas, such as the street name, city and country.
Certum Code Signing CA SHA2 has issued the Open Source Developer, Birunthan Mohanathas certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Open Source Developer, Birunthan Mohanathas files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/68 | Rainmeter.exe |
| 0/56 | Rainmeter.exe |
The detection percentage is based on that I've gathered 124 scan results for the Open Source Developer, Birunthan Mohanathas files. 0 of these scan reports came up with some sort of detection. If you like, you can view the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: