"Initialing" Your Deck

I'm in the process of creating a blog for my deck. I've seen some artists who have put their initial on the bottom corners of their cards (Ciro Marchetti, for example). Is this the only way to protect the work should it go up on a website for display? I ask because I have made use of the corners in my deck with other symbols and I don't want readers to get confused. Would this be the best way to protect my work, anyway? Thank you!

If you look closely, you can often see "watermark" text faintly emblazoned across the face of many on-line scans, to discourage piracy. I believe you can create this with most common publishing software.

Thank you. For now, it does solve that issue!