This post shows you how to add a audiences or groups to a document you wish to distribute, then track and monitor with DocRead for SharePoint 2010.

Note: You need to be a DocRead publisher to be able to assign user groups or audiences to a document. To read the post in full please go here : 'http://www.collaboris.co.uk/blogs/blog-post/helen-jones/2012/02/03/how-to-distribute-a-document-with-docread'