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This plugin allows you to require a secret key that is passed via the URL: http://example.com/post-title/?key=[string]
Specify the key in a custom value called “key” with the [string] or use the built in widget.
Stable version of the plugin are pushed to the WordPress repository,
but the latest version of the plugin can be found at:
https://bitbucket.org/excion/wpkeyme/
Issues/Bugs: https://bitbucket.org/excion/wpkeyme/issues