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You can Reader Enable (add Reader Extensions) using Acrobat Pro or the server side LiveCycle Reader Extensions module.

The Acrobat method is for one-off forms and has a EULA restriction.  LC Reader Extensions is meant for larger scale productions.

There are many posts on these forums on how to apply RE to your document, such as:

http://forums.adobe.com/message/2500755#2500755

http://forums.adobe.com/message/2445821#2445821