If your web log is not free, for example, if a store or shop for private wholesalers, opens the possibility of differentiating the content published on the web:

• The "anonymous" users will see only the contents public (not even know of the existence of a zone rivate content).
  

• Registered users can purchase and access exclusive content page which can place links to documents, images, videos, programs or any other content that is not available for those who do not is addressed.

 
If your customers are special to you, let them know.