Obtaining P3P Privacy Policies for Composite Services

Algorithm 2

The P3P policy structure and an example P3P policy from http://www.walmart.com/ (a P3P policy from walmart.com).

Policy{Entity (#business.name): walmart.com,…,

  𝑆₁{Purpose: (current, contact [opt-in]),

     Recipient: (ours),

     Retention: (indefinitely),

     Data: (#user.login, #user.home-info)}

   𝑆₂{Purpose: (current, develop [opt-in], contact [opt-in]),

      Recipient: (ours),

      Retention: (stated-purpose),

      Data: (#user.name, #user.login, #user.home-info)}}