Add Water Mark to Movie
Although SCREEN2SWF already have a option in setup to prevent others use your movie outside your website.(The ‘URL restrict’ option), you may still need to add water mark to your movie.
A typical water-mark is to type on it a copyright text of your website. You can do this by add a ‘Annotation’ object, and set period to whole movie, set ‘Opacity’ and disable the cloud. Like this, 
You can also use a advanced way of transparent image. First prepare a image with mask in tools like Photoshop. The format can be GIF or PNG which support transparent. The use ‘Image’ object instead of annotation. Like this,
A image with mask,(you can save it as GIF or PNG)
Insert as image for preview,
It is easy, isn’t it?