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What is the default collation?

By default the plugin uses the utf8generalci collation. You can change this in the code before installing the plugin.

Does this plugin work with Wordpress Mu?

Yes, in fact it started out as a Wordpress Mu plugin. Keep in mind though that it has been developed for use with the default wordpress 'database abstraction layer' for only one database. If you use HyperDB or multiple databases it will probably fail. If you happen to have multiple databases or use HyperDB I'd to receive a patch to make this work as well.

What license is this plugin under?

This license is by default licensed under the GPL. See the LICENSE file for the details.