Безопасен ли quickmark.com.tw?

I downloaded the Quickmark extension for Chrome and the PC and used it to decode and generate QR codes. I decided to purchase the full software and installed it on my PC. I had a little trouble with the order, but it was cleared up quickly. The activation of the software is via a scan of a Quick Code - which disturbs me a little because I have no idea what the scan did. I checked the system carefully and found it made a registry entry with a license code and installed a special data file in a system folder. I have been a little suspicious of this, but I think it is all working OK. I will monitor this closely.