![]() ![]() ![]() The design consists of a virtual audio device driver that forwards sound streams to a user-level network server. The technique is based on the implementation of hosted I/O VMMs that intercept device I/O instructions executed by a "guest" O/S and emulate them through system calls processed by device drivers of a "host" O/S. This weakness was discovered while creating a technique for remote transfer of audio streams generated by a Virtual Machine Monitor (VMM), to achieve network transparency for audio devices. This paper examines the architecture of present day systems and shows that they are not trustworthy enough to support certain DRM features/restrictions, even when the DRM delivery system exclusively utilizes signed and protected operating system components.
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