Do you plan to release the source code?
in my eyes it's a harmless question, not rude or insulting.
of course, what Brice is reporting was unfriendly, but i say, just ignore such.
maybe some linux users think "free" means "open source", then just tell them what GPL means,
charge them for the code and force them to open their code, too, if they use yours.
I also prefer source rather than a Lib, normally I use no UserLibs at all,
but I never would insult somebody if he doesn't want to share the source.
if he likes to share ideas, to tell me how he did it,
I'll welcome that and figure the coding out on my own.
and if not, well, than I'll have to find my own solution.
I often read code of other programmers, but always it's hard to get the point,
to realize what he does where how...
normally I can only get into it if i really
need this solution.
so what would be the use for anyone with code of mine,
if they are not really seeking a solution for exactly
this problem?
are they collecting tons of sources just to
have them?
I released a lot of different code-snippets and I found out,
that a lot of them were hardly recognized at all.
not that they were useless codes, but most people were working on other problems at that time.
quite often I linked them to question-topics some months later,
and they were welcomed like Columbus' egg....
so, if somebody asks for your source, give it if you want or keep it, it's up to you.
if someone flames you for keeping the code, ignore them.