[raving-richard]

These are all interesting, but defeated by me with one easy keyboard command (for the rest of you, it's View->Page Style->No Style). Without CSS, the main image is displayed just fine.

Some people really are trisky.

[pa7]

Without CSS it still displays the encrypted image with the Encryption / Decryption - technique, doesn't it?

[raving-richard]

Without JS, it's all bad :(. But, with JS, and without CSS, I can just right-click¸ view-image. This gives me the base64 in the address bar (Firefox).

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAPAAAADwCAYAAAA+VemSAAAgAElEQVR4nLS96ZMUV5rm6x/Czd2P7+7h4REeHntkZETkvkAmCYh

A simple save page later, and I get your image. Bang.