It's Rialto, I believe. I don't read German, so I can't tell how you would go about purchasing it. There's just an email address there for the foundry/designer (dftype@utanet.at). They don't seem to have a website.

I also notice that the ligatures in your sample aren't shown on the link I provided. Here's the specimen book PDF that was distributed a couple of years ago which shows the font in all its glory:

Rialto Rialto.pdf (155.9 k)