Patent ID: 8478959
Filing Date: 2013-07-02
Classification: G06F,G06T

Abstract:
1. A method for protecting content in graphics memory, the method comprising: receiving, from a client device, the content and a first privilege level; storing the first privilege level in a privilege map with restricted access, wherein the privilege map includes mappings between memory pages and privilege levels, each memory page of the privilege map is mapped to only one type of privilege level, and a first memory page in which the content is stored is associated with a first privilege level, and wherein the privilege map is accessed only by a memory management unit, and a privilege management unit and the first privilege level indicates which of a rendering engine, memory management unit, and central processing unit (CPU) may access the first memory page; and determining whether to permit a request to access the first memory page based on the first privilege level; wherein the privilege map is accessed, during a display process, to determine pixels that are visible based on the privilege levels when screen coordinates of at least one pixel within an area of content equal screen coordinates of at least one pixel within an area of another content at a second privilege level.