copyright flashing on saved images

Dear friends,

I came across some very cool animated gif�s on one of the sites I had 
visited sometime last month. I used the save as option to save the 
images on my hard disk, so that I could study them better later. When 
I opened the file I saw the words �unauthorized� flashing on the 
lower part of the animated gif and the owners e-mail address flashing 
on the upper art of the animated gif. 

Now what I would like to know is that how did that person manage to 
do that to his animated gif????? It�s an amazing way of preventing 
someone else from using images you have created. Do I need a special 
software for that???? Can I make that happen to static images also??

Looking forward to your reply�s via e-mail or post.

Best Wishes,
Sunil.

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Sunil Bahl :  sunilbahl(at)hotmail.com            ICQ: 16174772 
 
Webmaster of: 
 
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