Did you just run into a download or a file on your computer that is digitally signed by Sony Computer Entertainment Inc.? If that's the case, please read on.
You'll probably see Sony Computer Entertainment Inc. when double-clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can view the digital signature details for Sony Computer Entertainment Inc. with the following steps:
Here's a screenshot of a file that has been digitally signed by Sony Computer Entertainment Inc.:

As you can see in the screencap above, Windows states that "This digital signature is OK". This means that the file has been published by Sony Computer Entertainment Inc. and that the file has not been tampered with.
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 examine the address for Sony Computer Entertainment Inc., such as the street name, city and country.
GlobalSign CodeSigning CA - G2 has issued the Sony Computer Entertainment Inc. certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Sony Computer Entertainment Inc. files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/55 | CMA.exe |
| 0/47 | CMA.exe |
The detection percentage is based on the fact that I've collected 102 scan results for the Sony Computer Entertainment Inc. files. 0 of these scan reports came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: