Yes you right...
But it seems to me that I'll have to build the list of all "true" Debian packages - and see that they are not in "non-free", and the rest of the packages I'll go over the licenses manually to be sure.

Some non-free packages may be used and distributed freely but not modified.
I know. But for example I've found some restrictions in avm-firmware. I'm not a lawyer, and I don't have one, so I don't want to go over tens of licenses trying to figure out what restrictions they can add: Can I redestrebute them? Can I sell CDs with them? Can someone that takes the CD redistribute it once more? Do I need add "no reverse engeneering" license agreement? etc...

As you see for very practical reasons, its much easier to distribute GPL software.

So I want Kazit (Hebrew version of Knoppix) will be "free like a speech" and not "free like a beer".

Thanks.