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copyright protection of images

One concern she has is copyright protection of slide images that might be put on the web site. They may want to have images available for teaching but they do not want people to link to the images or to take the images and use them without their permission. Are there effective mechanisms for copyright protection of images on a web site? I think they might consider adding digital watermarks, displaying a visible copyright message on images, and blocking search engines from crawling in certain directories. This

Override imagecache module

There should be a module that lets people override the automatically resized and cropped image with one they did for that image and that size specifically. Especially for choosing what part of the image when a crop is necessary.

A workaround would be to create another separate imagefield that does not use imagecache that is used if anything is uploaded to it, but this involves template work and general kludginess.

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