I\'m writing a flash application and am afraid that it will be decompiled. In order to minimize this chance, I want to obfuscate the file.
I have heard of secureSWF
Take a look at open source compilers, like SWFMill and Haxe http://haxe.org/ they generated different byte-code in their final swf an can crash many of popular decompilers. Is obvious that the code can be obtained just like the ordinary adobe compiled swf, but many decompilers will just not work with it, so if you want to increase the 'amount of effort needed' I would suggest you to take a look at this solution and maybe create something mixing all of it.