The down and dirty explanation for my nine year old, as far as reverse
engineering Minetest texture packs and other little kid stuff, is that if you
don't see the GPL, it's proprietary so hands off.
Of course I have a deeper understanding when I've had my coffee. ;)
There are other licenses, of course, but one of the advantages of Trisquel
over Mint for "average joes" like myself and my family is that we don't have
to worry about licensing.
And let's face it, when we are under stress or losing our tempers about
trolls is when we are most likely to make mistakes.
It's not a joke when I say that switching from
as-free-as-I-could-make-it-at-the-time Ubuntu to Trisquel when I did probably
saved me from violating copyright laws in my country, getting caught, and
getting my half-educated self in a lot of trouble.
Having licensing issues taken care of by trustworthy individuals gives us the
space to learn, grow, and in some cases become hackers themselves and give
back to the community.
It's great to see so many new-to-Gnu people posting lately as well as
new-to-Trisquel people.