| 摘要 |
A system configurable at least between powered and unpowered states is provided. The system comprises a human interface device for receiving a multi-character alphanumeric code, one or more processors, memory storing programs executed by the processors, and a private key associated with the system. The one or more programs comprise instructions for evaluating usage of the system against a usage threshold. When usage of the system is within the usage threshold, the one or more processors permit the system to be in the powered state. When usage of the system exceeds the usage threshold, the one or more processors force the system to the unpowered state. Responsive to a determination that a received multi-character alphanumeric code is valid, the usage threshold is adjusted by an amount specified by the received code. |
| 主权项 |
1. An electronic device that hosts one or more services, each service in the one or more services configurable between an active state and at least one inactive state, the electronic device comprising:
a human interface device configured to receive a first multi-character alphanumeric code; one or more processors; a memory storing one or more programs to be executed by the one or more processors; a first private key associated with the electronic device, wherein the first private key is stored in at least a non-volatile portion of the memory; a first unit identifier that uniquely identifies the electronic device from among a plurality of electronic devices, wherein the first unit identifier is stored in at least a non-volatile portion of the memory; a first counter stored in the memory; wherein the one or more programs comprise instructions for:
evaluating usage of each respective service in the one or more services against a corresponding usage threshold, wherein,
when usage of the respective service is within the corresponding usage threshold, the respective service is maintained in the active state, andwhen usage of the respective service exceeds the corresponding usage threshold, the respective service is maintained in an inactive state in the at least one inactive state;decrypting the first multi-character alphanumeric code using the first private key thereby forming a decrypted multi-character alphanumeric code, wherein the decrypted multi-character alphanumeric code comprises a unit identifier field, a counter field and a payload;comparing the content of the unit identifier field to the first unit identifier;comparing the content of the counter field to the first counter;wherein, when the unit identifier field matches the first unit identifier and the counter field is within a first threshold distance of the first counter,
the payload is analyzed to adjust the usage threshold of a first service in the one more services identified by the payload by an amount specified by the payload, andthe first counter is advanced by a predetermined increment. |
