I'm sort of generally curious about this, since pre-Mac App Store apps one could simply open the font file from within the app's package contents and install it through Font Book to allow use outside that particular app.
When I use Add Fonts from within Font Book to add the fonts, I get the following 2 "serious errors":
Corrupt font name
- Font basic parsability
- System Validation
Now, is this something I'm just not supposed to be doing? As in, am I breaking a rule here? I'm not using these fonts for publication or commercial use - I just want them available throughout the system.