A stored document of a persistent data store can include digitally encoded content. A version of the stored document can be created that is placed in a non-persistent memory. This version can be referred to as a rendered document. Content from the rendered document can be presented in a user interface. A user selection of a user defined portion of the presented content can be received. Additionally, a user issued command to hide the selected portion of the presented content can be received. The rendered document can be responsively changed to omit the user defined portion of the presented content when outputting the presented content to at least one output device. The changing of the rendered document to omit the user defined portion is unable to affect the stored document in any fashion.