Did you just find a download or a file on your computer that is digitally signed by Ubisoft Entertainment? If so, please read on.
You will typically see Ubisoft Entertainment when clicking to run the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can view additional details from the Ubisoft Entertainment certificate with the following steps:
Here's a screenshot of a file signed by Ubisoft Entertainment:

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 Ubisoft Entertainment and that no one has tampered with the file.
If you click the View Certificate button shown in the screengrab 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, etc. You can also view the address for Ubisoft Entertainment, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA, VeriSign Class 3 Code Signing 2004 CA and VeriSign Class 3 Code Signing 2009-2 CA has issued the Ubisoft Entertainment certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Ubisoft Entertainment files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/48 | gu.exe |
| 0/47 | setup.exe |
| 0/53 | UPlayBrowser.exe |
The detection percentage is based on the fact that I have collected 148 scan reports for the Ubisoft Entertainment files. 0 of these scan reports came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: