Hi,
I'm a newbie graphic designer and I have a few questions to ask you guys.

- Does "Free for Commercial" fonts and "OFL" Fonts (checked from readme file and their websites.) allow me to use in commercial works for my clients? like logo, package, book covers, etc.
- What if authors change their license in the future?

I'm not good in English and don't want to run into trouble because of misunderstanding so...help me please.

Thanks

The only one who can give a reliable answer to you is the author. Contact him.
The other ones can only give to you a personal (and unreliable) opinion.

Thanks, Menhir.
I will try to contact the author.