This is set of permissions that portal installation program will assign
- Administrative User: Gets unlimited access on all resources
- Administrative Group(wpsadmins): Same as that of administrative user
- All Authenticated Portal User: Gets User or Privileged User rights on preinstalled portlets and some of the pages that get created as part of install process
- Anonymous Portal User: Gets User rights on public pages such as login, selfcare, sitemap,..
Take a look at Initial Access Control Settings for further information on what all rights are assigned to various user/groups during portal install