Those are the 2 signatures. They show who signed them, how and when.
If you select one of those signatures and then click Details, it will show you more information including the certificate used.
The point of these is they show they company that signed the software... so if you download say a file from Microsoft and the digital signature does not say Microsoft you know that the file cannot be trusted.
The file you downloaded says "Open Source Developer, Dominik Reichl" - which is verifiable as the developer.
Tbh, it's an ok method - the main problem being that most people don't know what information should be shown, so how do they know if it is incorrect. I prefer hash sums
http://keepass.info/integrity.html#sig