11. The system of claim 1 , wherein the one or more virtual machines are configured based on one or more specification version numbers of the PDF document.
11. The system of claim 1 , wherein the one or more virtual machines are configured based on one or more specification version numbers of the PDF document. 12. The system of claim 11 , wherein a specification version number of the one or more specification version numbers is used to identify a reader application version to be run in a virtual machine of the one or more virtual machines.