Digital image watermarking using DWT

Hello everyone, I want ask about watermarking.

Can I put secret key like/or a password when I want to embedding digital image watermark and when user want to extraction watermark they must insert secret key again?

I think the secret key is merges with an image when do embedding watermark

If you have a similar matlab code, can you put the code in comment please?

Thank you.

[Tommy Halim]

Up