This plugin uses the Hivelogic Enkoder, normally used to protect spambots from harvesting e-mail addresses, to enkode a hidden field on the form. That field is required when the user submits the form or they get an error.
To install: ./script/plugin install -x http://form-spam-protection.googlecode.com/svn/form_spam_protection/
These details are provided for information only. No information here is legal advice and should not be used as such.