Hi
I´m hoping this board will be really professional.
I´d tried to translate this following text from german in english.
It is a part of an article from an german "internet pro"
magazin.

Additional security functions for flash files
---------------------------------------------
1.disable caching

One method to protect the swf files is to disable the caching function of the browser.
You have to add followin metatags in the header of the HTML:
<META HTPP-EQUIV = „pragma“ content = „nocache“ >
<META HTPP-EQUIV = „expires“ content = „Thu, 1 January 1900 00:00:00 PST“>
For the date you can choose any time.

- The advantage is that no one can easily take your swf from temporary internet files.
- The disadvantage is that the user have to reload the swf at every new access.

2. wrong actionscript

Another method is a little bit more tricky and aims at a potentially hacker attack.
The trick is to place wrong action script in the movie to force the hacker to
identify the right code in order to look through the movie.
Very popular are deep hidden get-URL commands, which get relativ files from the server.
These files are invisible in the flash movie. Because the hacker don´t know this he has
To reconstruct the structure exactly.

3. URL-check

A simple way is the url-check. A little script in the movie check where the movie plays.
If the location is wrong an error message appear.
The script has the following structure:

Adress = this._urld;
Test = http://the domain.de/the swf.swf
If (adress == test){
Gotoandplay(2)
}else{
gotoandplay (100)
}
At frame 100 is the error message.

4. hidden files

The last possibility is to create one movie as a dummy movie which loads the real movie.
The name of the real movie can be covered as a *.jpeg or any other file format. Flash doesn´t matter which termination the file has .