Did you just find a file that has a digital signature from Suzhou Shijie Software Co., LTD? If so, please read on.
You'll typically notice Suzhou Shijie Software Co., LTD when double-clicking to run the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the Suzhou Shijie Software Co., LTD digital signature with the following steps:
Here is a screengrab of a file signed by Suzhou Shijie Software Co., LTD:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This means that the file has been published by Suzhou Shijie Software Co., LTD 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, and so on. You can also examine the address for Suzhou Shijie Software Co., LTD, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Suzhou Shijie Software Co., LTD certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Suzhou Shijie Software Co., LTD files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/50 | kuaizipdrive.sys |
| 0/56 | kz.exe |
The detection percentage is based on that I've gathered 106 scan reports for the Suzhou Shijie Software Co., LTD files. 0 of these scan reports 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 based on certificates with the following serial numbers: