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Protect Image Downloads: Beyond Standard Techniques
While preventing image downloads entirely is impossible, there are measures you can take to complicate the process and discourage casual users from downloading your images. Here are some additional techniques beyond transparent overlays and CSS background images:
Remove Context Menu Option
Using CSS, you can prevent users from saving images by removing the "Save Image" option from the right-click context menu. This will leave the rest of the context menu accessible:
img { pointer-events: none; }
Disable Drag and Drop
Another option is to disable drag-and-drop for images. This prevents users from dragging and dropping images to their desktop or other locations. You can do this with the following jQuery code:
$(document).on('dragstart', 'img', function(e) { e.preventDefault(); });
Hide Image URL
To make it more difficult for users to determine the direct URL of an image, you can hide it from the page's source code. This can be achieved using server-side scripting or custom JavaScript functions.
Watermark Images
Adding watermarks to your images can deter people from using them without permission. A noticeable watermark superimposed on the image will make it less appealing for unauthorized use.
Code Sample:
<img src="http://placekitten.com/600/450" ondragstart="return false;" />
This code combines the above techniques to disable drag and drop and prevent image downloads.
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