Did you just find a download or a file on your computer that has a digital signature from IBM Corporation? If that's the case, please read on.
You will probably notice IBM Corporation when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the IBM Corporation certificate with the following procedure:
Here is a screenshot of a file digitally signed by IBM Corporation:

As you can see in the screencap above, Windows states that "This digital signature is OK". This implies that the file has been published by IBM Corporation and that the file has not been tampered with.
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, and so on. You can also examine the address for IBM Corporation, such as the street name, city and country.
VeriSign Class 3 Code Signing 2004 CA has issued the IBM Corporation certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the IBM Corporation files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/53 | libeay32IBM080.dll |
The detection percentage is based on that I've collected 240 scan reports for the IBM Corporation files. 0 of these scan reports came up with some sort of detection. You can review 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: