You can get various of swf-decompiler tools such as Sothink Decompiler or eltima decompiler through googling. If the software has no bugs, it will decompile any .swf works in several seconds. That means, Someone can have all your flash works by cheating with decompiler. So far as I know, it is not forbidden as a unquestionable rule or something, only inhibits itself by morality. Is it mean that Decompile is going to be legalization? and, What's your point?