zitrusblau

This plugin can be used as a discrete but efficient tool for websites which have to make sure that copyright information for images is mandatory.
How it works: It simply blurs all uploaded images. The original only gets restored when the copyright info is set. 
The text field for the copyright info is provided as a form field in the attachment details view.
A simple but elegant solution to enforce copyright discipline among authors and editors.
This plugin is compatible with the plugin “Enhanced Media Library” (tested with version 2.4.5).

WP Copyright

Enforces copyright discipline by blurring all uploaded images as long as the associated copyright info is undefined.

redesigndavid

Everytime a post or page is published, updated, edited, or shown on your website, JD redesignImages would check for two things: hotlinked and oversized images. For every image that meets the criteria, it applies the filters set above. <a> and tags would then be updated to point to the new images saved in your ?uploads folder? (images that are _suffixed according to your settings).</a>
Optionally, fitters like grayscale, tint, blur and others may also be applied.

JD-redesign-images

JD-redesign-images checks posts for hotlinked and oversized images, afterwhich it will download images, resize if neccessary and apply filters you spe …

WP Copyright vs JD-redesign-images