This plugin will check the filesize and md5 hash of an uploaded image against the files in the database and deny the upload if it finds a duplicate.
Note: his will only work with the default HTML and Flash upload methodes.
Install through plugin manager. You will have to trigger "Create missing hashes" to get existing images recognized.
Uninstall via plugin manager
This plugin does not have additional configuration.
You can use this plugin as you like for personal and commercial use. Altering/ removing copyright information or selling the plugin is not allowed.