That is a very good question to ask and you should always be concerned about any online purchasing.  I haven't brought anytihing in a while from here but it seems to me that like most sites that you buy from there is a statement or link to another page that talks about your concerns when you are completing a purchase.

You can always send an email to sales@stardock.com and ask them directly.

I've been here and subscribing for over four years now without any problems.

Yup, it's secure. Why not talk to someone at Stardock sales:  1-888-STARDOCK.

Smiles, AKA!

look at the url for the site first. you'll notice the actual site stardock uses for purchasing apps starts with "https". the "s" lets you know it's a secure site. if i see the "https" when buying merchandsise online, i feel safe since i'll know it's secure.