1. A content relicensing method comprising:
indicating the occurrence of a relicensing trigger event in a client electronic device;
generating a license request for the client electronic device;
receiving an expiration indicator for a subscription associated with the client electronic device;
creating a device license for the client electronic device that includes the license request and the expiration indicator; and
creating a secure device license by digitally-securing the device license.
2. The method of claim 1 further comprising:
providing the license request to a media distribution system; and
providing the device license to the client electronic device.
3. The method of claim 1 wherein the license request includes at least one of:
a user ID that identifies the subscription; a challenge; and a device digital certificate for the client electronic device.
4. The method of claim 1 further comprising:
digitally-signing the license request to form a signed license request.
5. The method of claim 4 further comprising:
verifying the integrity of the signed license request.
6. The method of claim 1 wherein the device license includes at least one of:
a licensing service digital certificate; a system time indicator; and a user encryption key.
7. The method of claim 1 further comprising:
verifying the integrity of the secure device license.
8. The method of claim 1 wherein the relicensing trigger event includes at least one of: a docking event; an expiration of a predetermined period of time; and an entry into a relicensing interval of time.
9. The method of claim 1 further comprising:
using the secure device license to render media data stored on the client electronic device.
10. The method of claim 9 further comprising:
verifying that the secure device license is valid before rendering the media data.
11. A computer program product residing on a computer readable medium having a plurality of instructions stored thereon which, when executed by a processor, cause the processor to perform operations comprising:
indicating the occurrence of a relicensing trigger event on a client electronic device;
generating a license request for the client electronic device;
receiving an expiration indicator for a subscription associated with the client electronic device;
creating a device license for the client electronic device that includes the license request and the expiration indicator; and
creating a secure device license by digitally-securing the device license.
12. The computer program product of claim 11 further comprising instructions for performing operations comprising:
providing the license request to a media distribution system; and
providing the device license to the client electronic device.
13. The computer program product of 11 wherein the license request includes at least one of:
a user ID that identifies the subscription; a challenge; and a device digital certificate for the client electronic device.
14. The computer program product of claim 11 further comprising instructions for performing operations comprising:
digitally-signing the license request to form a signed license request.
15. The computer program product of claim 14 further comprising instructions for performing operations comprising:
verifying the integrity of the signed license request.
16. The computer program product of claim 11 wherein the device license includes at least one of:
a licensing service digital certificate; a system time indicator; and a user encryption key.
17. The computer program product of claim 11 further comprising instructions for performing operations comprising:
verifying the integrity of the secure device license.
18. The computer program product of claim 11 wherein the relicensing trigger event includes at least one of: a docking event; an expiration of a predetermined period of time; and an entry into a relicensing interval of time.
19. The computer program product of claim 11 further comprising instructions for performing operations comprising:
using the secure device license to render media data stored on the client electronic device.
20. The computer program product of claim 19 further comprising instructions for performing operations comprising:
verifying that the secure device license is valid before rendering the media data.
21. A system comprising:
a client electronic device configured to perform operations comprising:
indicating the occurrence of a relicensing trigger event on a client electronic device; and
generating a license request for the client electronic device; and a server computer configured to perform operations comprising:
receiving an expiration indicator for a subscription associated with the client electronic device,
creating a device license for the client electronic device that includes the license request and the expiration indicator, and
creating a secure device license by digitally-securing the device license.
22. The system of claim 21 wherein:
the client electronic device is further configured to perform operations comprising:
providing the license request to a media distribution system; and
the server computer is further configured to perform operations comprising:
providing the device license to the client electronic device.
23. The system of claim 21 wherein the license request includes at least one of:
a user ID that identifies the subscription; a challenge; and a device digital certificate for the client electronic device.
24. The system of claim 21 wherein the client electronic device is further configured to perform operations comprising:
digitally-signing the license request to form a signed license request.
25. The system of claim 24 wherein the server computer is further configured to perform operations comprising:
validating the integrity of the signed license request.
26. The system of claim 21 wherein the device license includes at least one of:
a licensing service digital certificate; a system time indicator; and a user encryption key.
27. The system of claim 21 wherein the client electronic device is further configured to perform operations comprising:
validating the integrity of the secure device license.
28. The system of claim 21 wherein the relicensing trigger event includes at least one of: a docking event; an expiration of a predetermined period of time; and an entry into a relicensing interval of time.
29. The system of claim 21 wherein the client electronic device is further configured to perform operations comprising:
using the secure device license to render media data stored on the client electronic device.
30. The system of claim 29 wherein the client electronic device is further configured to perform operations comprising:
verifying that the secure device license is valid before rendering the media data.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sensor assembly comprising:
a first transducer coupled to a machine and oriented with respect to a first axis, said first transducer configured to sense vibration energy of the machine with respect to the first axis and transmit a signal indicative of the sensed vibration energy;
a second transducer coupled to the machine and oriented with respect to a second axis that is different than the first axis, said second transducer configured to sense vibration energy of the machine with respect to the second axis and transmit a signal indicative of the sensed vibration along the second axis;
a control module coupled with said first transducer and said second transducer, said control module configured to selectively switch said sensor assembly between a first mode of operation wherein said sensor assembly measures an amount of vibration energy induced to said sensor assembly by the machine, and a second mode of operation wherein said sensor assembly stores an amount of energy induced to said sensor assembly; and
a power storage device coupled to said first transducer and to said second transducer for receiving electrical energy from said first transducer and said second transducer, said control module configured to switch said sensor assembly from the first mode of operation to the second mode of operation when an energy level of said power storage device is approximately equal to a predefined energy level.
2. A sensor assembly in accordance with claim 1, wherein said first transducer comprises at least one of a piezoelectric material and a moving coil sensor.
3. A sensor assembly in accordance with claim 1, wherein said first transducer is oriented substantially parallel to a centerline extending axially through said sensor assembly such that said first transducer at least one of detects and harvests energy from vibrations induced substantially parallel to the centerline.
4. A sensor assembly in accordance with claim 3, wherein said second transducer is configured to at least one of detect and harvest energy from vibrations induced substantially transverse to the centerline.
5. A sensor assembly in accordance with claim 1, further comprising a signal conditioning module coupled with said first transducer and configured to at least one of rectify, synchronously switch, regulate, adjust a voltage level of, and convert to direct current a signal received from said first transducer.
6. A monitoring system comprising:
at least one sensor assembly comprising:
a first transducer coupled to a machine and oriented with respect to a first axis, said first transducer configured to sense vibration energy of the machine with respect to the first axis and transmit a signal indicative of the sensed vibration energy along the first axis; and
a second transducer coupled to the machine and oriented with respect to a second axis that is different than the first axis, said second transducer configured to sense vibration energy with respect to the second axis and transmit a signal indicative of the sensed vibration energy along the second axis;
at least one sensor node coupled with said at least one sensor assembly;
a control module coupled with said first transducer and said second transducer, said control module configured to selectively switch said at least one sensor assembly between a first mode of operation wherein said at least one sensor assembly measures an amount of vibration energy induced to said at least one sensor assembly by the machine, and a second mode of operation wherein said at least one sensor assembly stores an amount of energy induced to said at least one sensor assembly; and
a power storage device positioned within at least one of said at least one sensor node and said at least one sensor assembly, said control module configured to switch said at least one sensor assembly from the first mode of operation to the second mode of operation when an energy level of said power storage device is approximately equal to a predefined energy level.
7. A monitoring system in accordance with claim 6, wherein said at least one sensor node comprises a communication module configured to:
receive a signal from said first transducer when said at least one sensor assembly is operating in the first mode; and
transmit the signal to a remote system.
8. A monitoring system in accordance with claim 6, wherein said power storage device is configured to receive a signal from said first transducer when said at least one sensor assembly is operating in the second mode.
9. A monitoring system in accordance with claim 6, wherein said first transducer comprises at least one of a piezoelectric material and a moving coil sensor.
10. A monitoring system in accordance with claim 6, wherein said first transducer is oriented substantially parallel to a centerline extending axially through said at least one sensor assembly such that said first transducer at least one of detects and harvests energy from vibrations induced substantially parallel to the centerline.
11. A monitoring system in accordance with claim 10, wherein said second transducer is configured to at least one of detect and harvest energy from vibrations induced at least one of substantially transverse to the centerline.
12. A monitoring system in accordance with claim 6, further comprising a signal conditioning module coupled with said first transducer and configured to at least one of rectify, synchronously switch, regulate, adjust a voltage level of, and convert to direct current a signal received from said first transducer.
13. A sensor assembly for use in detecting and harvesting vibrations within a machine, said sensor assembly comprising:
a first transducer coupled to a machine and oriented with respect to a first axis, said first transducer configured to sense vibration energy of the machine with respect to said first axis and transmit a first signal representative of an amount of vibrational energy induced to said sensor assembly by the machine;
a second transducer coupled to the machine and oriented with respect to a second axis that is different than said first axis, said second transducer configured to sense vibration energy with respect to the second axis and transmit a second signal representative of an amount of vibrational energy induced to said sensor assembly along said second axis;
a control module coupled with said first transducer and said second transducer, said control module configured to selectively switch said sensor assembly between a sensing mode of operation and an energy harvesting mode of operation; and
a power storage device coupled with said control module, said control module further configured to:
transmit the first signal and the second signal to a sensor node when said sensor assembly is operating in the sensing mode;
transmit the first signal and the second signal to said power storage device when said sensor assembly is operating in the energy harvesting mode; and
switch said sensor assembly from the energy harvesting mode to the sensing mode when an energy level of said power storage device is approximately equal to a predefined energy level.
14. A sensor assembly in accordance with claim 13, further comprising a signal conditioning module coupled with said first transducer and configured to at least one of rectify, synchronously switch, regulate, adjust a voltage level of, and convert to direct current the signal received from said first transducer.
15. A sensor assembly in accordance with claim 13, wherein said first transducer comprises at least one of a piezoelectric material and a moving coil sensor.
16. A sensor assembly in accordance with claim 13, wherein said second transducer comprises a piezoelectric material.
17. A sensor assembly in accordance with claim 13, wherein said first transducer is oriented substantially parallel to a centerline extending axially through said sensor assembly such that said first transducer at least one of detects and harvests energy from vibrations induced substantially parallel to the centerline.
18. A sensor assembly in accordance with claim 17, wherein said second transducer is configured to at least one of detect and harvest energy from vibrations induced substantially transverse to the centerline.