The White Paper is about our Interaction Hub product (previously called Enterprise Portal or Portal Solutions) release 9.1, that will soon be able to use PUM Images to apply maintenance. This process is called "Selective Adoption".
Customers currently using Interaction Hub 9.1 can prepare to use Selective Adoption by upgrading to a minimum PeopleTools release of 8.53.10 or higher, or to any patch level of PT8.54. The White Paper also lists additional requirements regarding PeopleTools releases and resolutions to be installed, depending on the PeopleTools release and if a site is English-only or Multi-Language.
To learn more about using PUM Images for applying application maintenance, please see the PUM Home Page, tab Learning About PeopleSoft Update Manager > then at left, Training and Resources > Training Links > PUM End to End training modules 1, 2, 3.