> Just a couple of days ago I was attacked because I use "copyrighted" icon-sets and
> he immediately threatened me legally.

"I assume correct permissions and licenses have been obtained to embed in the OS or otherwise stored and accessed."
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=37959&forum=47&start=40#714764

Where is the attack let alone the legal threat?