Did you just find a download or a file on your computer that has a digital signature from Doctorsoft Co., Ltd.? If so, please read on.
You will typically notice Doctorsoft Co., Ltd. when running the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can also view the Doctorsoft Co., Ltd. certificate with the following steps:
Here's a screenshot of a file signed by Doctorsoft Co., Ltd.:

As you can see in the screengrab above, Windows reports that "This digital signature is OK". This means that the file has been published by Doctorsoft Co., Ltd. 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, and so on. You can also view the address for Doctorsoft Co., Ltd., such as the street name, city and country.
Thawte Code Signing CA has issued the Doctorsoft 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 Doctorsoft Co., Ltd. files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/47 | APLangApp.exe |
| 0/41 | APLangApp.exe |
| 0/50 | APLanMgrC.exe |
| 0/44 | APLanMgrC.exe |
The detection percentage is based on the fact that I have gathered 182 scan reports for the Doctorsoft Co., Ltd. files. 0 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan results by examining the files listed above.
The analysis is done on certificates with the following serial numbers: