About SWF

[dickylam]

I have seen most of the flash has the extension of "*.SWF" when browing internet pages. I have few questions:-

1. Is it the only SWF extension, any other extension have similar result (except animated GIF) ?

2. These SWF can be revering engineering into fla ?

3. Will the swf format be stolen (means download) once posted to the internet ?

4. SWF can make license the copyright ?

Thanks.