Patent number 8751855 is assigned to SanDisk IL Ltd. (Kfar Saba, IL).
The following quote was obtained by the news editors from the background information supplied by the inventors: "It is sometimes desired for a memory device, such as a memory card, to perform a time-based activity, such as, but not limited to, determining whether a digital rights management (DRM) license has expired. Many memory devices do not have a battery and, thus, are unable to run an internal real-time clock to keep track of time. Some memory devices rely upon a software agent running in a host device to provide the memory device with a time stamp. In operation, the software agent running in the host device would obtain a time stamp from an external time source (such as a time server in a network) and send the signed time stamp to the memory device. Since the software agent obtains the time stamp from an external time source, the memory device will not be able to receive a time stamp from the external time source when the host device is not able to connect to the external time source (e.g., when the host device is not connected to the Internet or loses its wireless connection) or if the host is not running the agent (e.g., if the agent is not supported by the host platform, if the agent was terminated, etc.). In such a situation, the memory device can perform a time-based activity using a previously-received time stamp. However, performing the time-based activity with a stale time stamp may lead to an inefficient or unintended result (e.g., allowing access to content based on the stale time stamp even though the content license is actually expired)."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "Embodiments of the present invention are defined by the claims, and nothing in this section should be taken as a limitation on those claims.
"By way of introduction, the embodiments described below generally relate to a method and memory device for generating a time estimate. In one embodiment, a memory device generates a time estimate from time stamps in file system metadata for a plurality of files stored in the memory device and uses the time estimate to perform a time-based activity in the memory device. In another embodiment, a memory device generates a time estimate from time stamps stored in a plurality of files stored in the memory device and uses the time estimate to perform a time-based activity in the memory device. In yet another embodiment, a memory device obtains a plurality of time stamps, selects one ore more of the plurality of time stamps based on validity rankings, generates a time estimate from the selected time stamp(s), and uses the time estimate to perform a time-based activity in the memory device.
"Other embodiments are provided, and each of the embodiments can be used alone or together in combination. Various embodiments will now be described with reference to the attached drawings."
URL and more information on this patent, see: Yairi, Rahav; Pomerantz, Itzhak; Dror, Itai; Stern, Ori. Method and Memory Device for Generating a Time Estimate. U.S. Patent Number 8751855, filed
Keywords for this news article include: Software, SanDisk IL Ltd..
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