Abstract: In one set of embodiments, an enhanced next generation anti-virus (NGAV) system is provided. In certain embodiments, this system includes a hypervisor-level agent that backs up VM data only when an instance of a guest application running in the VM has been flagged by the NGAV system as being potentially malicious (rather than on a constant, proactive basis). Further, the hypervisor-level agent performs this backup only with respect to data modified by that specific guest application instance (rather than backing up all data modified by the VM) and writes the backed-up data to a secure storage location which is inaccessible to the guest. The combination of these features addresses many of the problems and inefficiencies of existing NGAV systems.

Abstract: A co-channel communication system allows transmission of one or more data signals in an active or visible portion of a video raster in a manner that is imperceptible to a viewer. More particularly, the data signal is transmitted over a preselected active video lines of a video raster. In order to reduce the perceptibility of the data signal, the video lines over which the data signal is transmitted is varied according to a random sequence. In an alternate embodiment, the data is also modulated at relatively low modulation levels, for example, by converting the data signal to a spread spectrum signal.