Method and apparatus for determining the proximity of a client device

An apparatus for determining proximity of a client device, comprising:

• means for acquiring a plurality of key management requests from said client device, wherein each of the plurality of key management requests includes a request to obtain a decryption key specific to a digital content to allow said client device to access the digital content from a content server;
• means for transmitting a measurement request to said client device in response to acquiring each said key management request;
• means for receiving a measurement reply from said client device in response to each measurement request;
• means for determining if a measurement parameter associated with said transmitting and said receiving exceeds a predetermined threshold;
• and
• means for transmitting a response to each said key management request to said client device when said predetermined threshold is not exceeded, wherein the response includes the decryption key specific to the digital content that allows said client device to access digital content from said content server.

A non-transitory computer readable medium having stored thereon instructions that, when executed by a processor, causes the processor to perform a method for determining proximity of a device, comprising:

• acquiring a plurality of key management requests from said client device, wherein each of the plurality of key management requests includes a request to obtain a decryption key specific to a digital content to allow said client device to access the digital content from a content server;
• transmitting a measurement request to said client device in response to acquiring each said key management request;
• receiving a measurement reply from said client device in response to each measurement request;
• determining if a measurement parameter associated with said transmitting and said receiving exceeds a predetermined threshold;
• and
• transmitting a response to each said key management request to said client device when said predetermined threshold is not exceeded, wherein the response includes the decryption key specific to the digital content that allows said client device to access digital content from said content server.