A method comprising: receiving a request at a processor system in a mobile device, from an electronic book viewer device that is separate from the mobile device, to provide content (110, 120) for display on the electronic book viewer device, the processor system being a host of the electronic book viewer device to store content and corresponding content protection policies; the electronic book viewer device having removably attachable display panels; the panels each having at least an attached mode configuration and a detached mode configuration; determining whether the content is protected from display on the electronic book viewer device based on one or more first content protection policies and one or more second content protection policies; providing a first portion of the content to the electronic book viewer device based on the one or more first content protection policies allowing the first portion to be displayed on the electronic book viewer device; and providing a second portion of the content to the electronic book viewer device if the one or more second content protection policies allow the second portion of the content to be displayed on the electronic book viewer device, wherein the second portion of the content includes user-authored information that is supplemental to pre-existing information of the first portion of the content, and wherein the one or more second content protection policies indicate whether the user-authored information is allowed to be displayed separately to the one or more first content protection policies allowing the first portion of the content to be displayed; the content protection policies being further defined based on the panel mode configuration. receiving a request at a processor system in a mobile device, from an electronic book viewer device that is separate from the mobile device, to provide content (110, 120) for display on the electronic book viewer device, the processor system being a host of the electronic book viewer device to store content and corresponding content protection policies; the electronic book viewer device having removably attachable display panels; the panels each having at least an attached mode configuration and a detached mode configuration; determining whether the content is protected from display on the electronic book viewer device based on one or more first content protection policies and one or more second content protection policies; providing a first portion of the content to the electronic book viewer device based on the one or more first content protection policies allowing the first portion to be displayed on the electronic book viewer device; and providing a second portion of the content to the electronic book viewer device if the one or more second content protection policies allow the second portion of the content to be displayed on the electronic book viewer device, wherein the second portion of the content includes user-authored information that is supplemental to pre-existing information of the first portion of the content, and wherein the one or more second content protection policies indicate whether the user-authored information is allowed to be displayed separately to the one or more first content protection policies allowing the first portion of the content to be displayed; the content protection policies being further defined based on the panel mode configuration. determining whether the content is protected from display on the electronic book viewer device based on one or more first content protection policies and one or more second content protection policies; providing a first portion of the content to the electronic book viewer device based on the one or more first content protection policies allowing the first portion to be displayed on the electronic book viewer device; and providing a second portion of the content to the electronic book viewer device if the one or more second content protection policies allow the second portion of the content to be displayed on the electronic book viewer device, wherein the second portion of the content includes user-authored information that is supplemental to pre-existing information of the first portion of the content, and wherein the one or more second content protection policies indicate whether the user-authored information is allowed to be displayed separately to the one or more first content protection policies allowing the first portion of the content to be displayed; the content protection policies being further defined based on the panel mode configuration.