Did you just download a file that is digitally signed by Plex, Inc and wonder if the file is safe? If that's the case, please read on.
You will typically notice Plex, Inc when running the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the Plex, Inc certificate with the following procedure:
Here is a screenshot of a file digitally signed by Plex, Inc:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This means that the file has been published by Plex, Inc and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can examine 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 Plex, Inc, such as the street name, city and country.
DigiCert SHA2 Assured ID Code Signing CA has issued the Plex, Inc certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screengrab above.
The following are the Plex, Inc files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/62 | plex update service.exe |
| 0/61 | PlexScriptHost.exe |
| 0/64 | plex update service.exe |
The detection percentage is based on that I have gathered 187 scan reports for the Plex, Inc files. 0 of these scan results came up with some sort of detection. You can review the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: