Simple nonautonomous peering media clone detection
A playback device includes a port configured to receive content from an external memory device, a device memory residing in the device, and a controller programmed to execute instructions that cause the controller to read a read data pattern from the defined region in the external memory device and determine if the read data pattern correlates to an expected data pattern to a predetermined level, wherein the expected data pattern is derived at least in part from a defect map of the defined region.
1 . A system for validating media content, the system comprising a content memory device that is configured to:
read a unique data pattern written to the content memory device of a validation entity by one of a manufacturer or a content provider, the unique data pattern being altered by known content memory device defects in the content memory device, the known content memory device defects being identified by a defect map that is stored by the validation entity, wherein the unique data pattern is stored in a memory of the content memory device before the content memory device is coupled to a playback device;
transmit the unique data pattern from the content memory device to the playback device such that the playback device is configured to validate the content memory device based on the unique data pattern and the defect map; and
transmit content from the content memory device and to the playback device, responsive to a validation of the content memory device performed using the transmitted unique data pattern.
2 . The system of claim 1 , wherein the playback device is further configured to generate the unique data pattern and write the unique data pattern to the content memory device.
3 . The system of claim 1 , wherein the playback device is configured to validate the content memory device by altering the unique data pattern using the defect map to produce an expected data pattern and to compare the expected data pattern with the unique data pattern and wherein the playback device only allows access to content stored in the content memory device if the content memory device is validated.
4 . The system of claim 1 , wherein the playback device is further configured to read the unique data pattern at least twice to detect an expected intermittent defect.
5 . The system of claim 1 , wherein the playback device is further configured to validate the content memory device based on the unique data pattern and the defect map by comparing the unique data pattern to an expected data pattern, wherein the playback device is further configured to compute the expected data pattern according to the defect map and the unique data pattern.
6 . The system of claim 1 , wherein the playback device is further configured to validate the content memory device based on the unique data pattern and the defect map by comparing the unique data pattern to the known content memory device defects and comparing the unique data pattern with the defect map.
7 . The system of claim 1 , wherein the playback device is configured to validate the content memory device based on the unique data pattern and the defect map-by error correcting the unique data pattern to regenerate the unique data pattern, comparing the unique data pattern to the regenerated unique data pattern to identify the known content memory device defects, and comparing the identified defects with the defect map.
8 . The system of claim 1 , wherein the content memory device includes cells, each having a probability of defect;
and the playback device is configured to validate the content memory device upon the unique data pattern, the defect map, and the probability of a respective defect in each of the cells.
9 . The system of claim 8 , wherein the playback device is configured to validate the content memory device by matching the unique data pattern and the known content memory device defects according to the defect map and a correlation measure determined from the probability of a defect in each of the cells.
10 . The system of claim 1 , wherein the known content memory device defects are identified by post-manufacturing testing of the content memory device.
11 . A method for securing media content, the method comprising:
reading a unique data pattern written to a content memory device of a validation entity by one of a manufacturer or a content provider, the unique data pattern being altered by known content memory device defects in the content memory device, the known content memory device defects being identified by a defect map that is stored by the validation entity, wherein the unique data pattern is stored in a memory of the content memory device before the content memory device is coupled to a playback device;
transmitting the unique data pattern from the content memory device to the playback device such that the playback device is configured to validate the content memory device based on the unique data pattern and the defect map; and
transmitting content from the content memory device and to the playback device, responsive to a validation of the content memory device performed using the transmitted unique data pattern.
12 . The method of claim 11 , wherein the playback device is further configured to generate the unique data pattern and write the unique data pattern to the content memory device.
13 . The method of claim 11 , wherein the playback device is configured to validate the content memory device by altering the unique data pattern using the defect map to produce an expected data pattern and to compare the expected data pattern with the unique data pattern and wherein the playback device only allows access to content stored in the content memory device if the content memory device is validated.
14 . The method of claim 11 , wherein the content memory device includes cells, each having a probability of defect;
and the playback device is configured to validate the content memory device upon the unique data pattern, the defect map, and the probability of a defect in each of the cells.
15 . The method of claim 11 , wherein the known content memory device defects are identified by post-manufacturing testing of the content memory device.
16 . A non-transitory computer readable medium having program instructions stored thereon, wherein when executed by a processor, cause the processor to perform operations comprising:
reading a unique data pattern written to a content memory device of a validation entity by one of a manufacturer or a content provider, the unique data pattern being altered by known content memory device defects in the content memory device, the known content memory device defects being identified by a defect map that is stored by the validation entity, wherein the unique data pattern is stored in a memory of the content memory device before the content memory device is coupled to a playback device;
transmitting the unique data pattern from the content memory device to the playback device such that the playback device is configured to validate the content memory device based on the unique data pattern and the defect map; and
transmitting content from the content memory device and to the playback device, responsive to a validation of the content memory device performed using the transmitted unique data pattern.
17 . The non-transitory computer readable medium of claim 16 , wherein the content memory device includes cells, each having a probability of defect; and the playback device is configured to validate the content memory device based on the unique data pattern, the defect map, and the probability of a defect in each of the cells.
18 . The non-transitory computer readable medium of claim 16 , wherein the known content memory device defects are identified by post-manufacturing testing of the content memory device.