> I think the best example is "Free as in Beer."
quoted text
>

Which already misses the point.

quoted text
> I can brew beer all day.
>
> I can keep it to myself.
>
> I can also share it.
>
> If I share a beer with you, it is free. (I am giving it to you)
>

If you sell it to me it's also free. You are missing the point.

quoted text
> If I share a beer with you under the BSDL, then I expect you to tell
> people I gave you that beer should they taste it and enjoy it as well.
> (I want you to tell them whether they enjoyed it or not.)
>
> If, however, I share a beer with you under the GPL then you are
> required to follow an entire listing on proper procedure and protocol
> for sharing that beer. In fact, unless you are ready to make the ingredients
> available to everyone else, you better not experiment with my beer.
>
>

Making an analogy with concrete examples is not useful because they are
different from information.

You could make an analogy with recipes:

If the recipe is under the GPL, if you give someone an obfuscated
recipe you would have to give the real recipe.

But it's not very useful either.