Buh! Thx Andre for your answer and the link :) Very interesting, but hard to understand for a novice. So I can see it's only Windows problem if I'm not wrong. So on a Linux machine there's no (not know) risk to enable @Font ...
Thx! ;)
Andre Mankel :
Downloading fonts may be dangerous although the chances are rather low. But as always, this is subject to many circumstances.
https://threatpost.com/of-truetype-font-vulnerabilities-and-the-windows-kern...
Best wishes Andre