CN103377323B - Digital rights management (DRM) protecting device and DRM license using method - Google Patents
Digital rights management (DRM) protecting device and DRM license using method Download PDFInfo
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- CN103377323B CN103377323B CN201210126842.2A CN201210126842A CN103377323B CN 103377323 B CN103377323 B CN 103377323B CN 201210126842 A CN201210126842 A CN 201210126842A CN 103377323 B CN103377323 B CN 103377323B
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Abstract
The invention discloses a digital rights management (DRM) protecting device and system and a DRM license using method. The DRM protecting device is connected with a mobile terminal through an audio frequency device, audio frequency signals are converted into digital signals through a signal processing module to be output to the DRM protecting device, the digital signals are converted into the audio frequency signals to be output to the mobile terminal, and information interaction between the DRM protecting device and the mobile terminal through the audio frequency signals is achieved. Through the technical scheme, the problem that in the prior art, a DRM license can only be used by means of a computer or by universal serial bus (USB) interface connection and the mobile terminal without a USB interface cannot pass DRM license verification to use digital media files is solved; a microphone pole of an audio frequency interface and an earth pole are further identified simultaneously prior to signal processing, and the problem that the microphone pole of the audio frequency interface and the earth pole are not fixed so that data communication cannot be performed is solved.
Description
Technical field
The present invention relates to digital copyright management field, more particularly, to drm protection device and drm license file using method.
Background technology
Drm (digital rights management, digital copyright management) is the synthesis solution based on information security technology
Certainly scheme, can stop illegally using and copying to digital media file effectively, reach the mesh of the digital intellectual property of protection
's.With the arrival of digital times, drm becomes more and more important, drm have become as the development of digitized content basis and
Ensure.
Drm licensing, is typically stored on computer, and binds use with computer, and user can only be in storage drm
Using drm licensing on the computer of licensing, other computers cannot use；Also have and drm licensing is stored shifting
Dynamic memory, is then connected with computer by usb and uses digital media file using drm license validation.
Rapidly develop with mobile terminal device such as mobile phone, panel computer etc., digital media file is in mobile terminal
Using being also rapidly developed, but, because a lot of mobile terminal devices are not provided with usb interface, lead to drm licensing
Cannot use in the terminal.
Content of the invention
Drm protection device and the using method of drm licensing that the present invention provides, can solve the problem that in prior art and move
Terminal is not provided with usb interface and cannot use the problem of drm licensing.
For solving above-mentioned technical problem, the present invention employs the following technical solutions:
A kind of drm protection device, carries out data interaction by the COBBAIF of audio frequency apparatus and audio frequency apparatus, including safety
Authentication module and signal processing module；Wherein, described signal processing module, is connected to security authentication module, for receiving sound
Frequency signal is simultaneously converted into data signal and exports described security authentication module, and the numeral letter receiving from security authentication module
Number being converted to audio signal exports audio frequency apparatus；Described security authentication module, for storing drm licensing, and receives certification
The solicited message and certification request information being received being authenticated using drm licensing, is sent to authentication result described
Signal processing module.
In an embodiment of the present invention, this signal processing module include audio interface microphone pole and earth polar control module,
Audio signal reception module, the first audio signal modular converter, the second audio signal modular converter and audio signal sending module,
Described audio signal reception module is docked with the sound channel pole of COBBAIF, wherein, the control in described audio interface microphone pole and earth polar
Molding block be used for the Mike pole of described COBBAIF and earth polar are identified, by described audio signal sending module with identify
Mike pole docking, ground potential is docked with the earth polar identified；Described audio signal reception module is used for by described audio frequency
The sound channel pole of interface receives the audio signal from described audio frequency apparatus；Described first audio signal modular converter is used for being derived from
The audio signal of described audio frequency apparatus is converted to data signal；Described second audio signal modular converter is used for treating to described sound
The data signal that frequency equipment sends is converted to audio signal；Described audio signal sending module is used for by described COBBAIF
The audio signal that the data signal treating to send to described audio frequency apparatus is converted into is sent by Mike pole to described audio frequency apparatus.
In an embodiment of the present invention, this second audio signal modular converter is current mode D/A converter module.
In an embodiment of the present invention, this current mode D/A converter module is passed through to extract from the Mike pole of described COBBAIF
The audio signal that the mode of electric current will convert into sends to described audio frequency apparatus.
In an embodiment of the present invention, the control module in this audio interface microphone pole and earth polar includes: acquisition module, is used for
Obtain described audio frequency apparatus open recording channel after, in its COBBAIF a pair of audio input extremely in each pole electric signal；Know
Other module, for according to the pair of audio input extremely in the electric signal of each pole identify described Mike pole and earth polar；Port switches
Module, after identifying Mike pole and earth polar for described identification module, by described audio signal transmitting element and described Mike
Pole is docked, and ground potential is docked with described earth polar.
In an embodiment of the present invention, this acquisition module is voltage domain modular converter, in the pair of audio input
Set up current channel between pole, ground reference is accessed in the node of described current channel, obtain the pair of audio input
In extremely, each pole is with respect to the voltage relative value of described ground reference.
In an embodiment of the present invention, this identification module includes the first identification submodule, for detecting the pair of audio frequency
The positive negative characteristic of the voltage relative value of each pole in input extremely, identifies described Mike pole and described earth polar according to testing result.This knowledge
Other module also includes the second identification submodule, for by the pair of audio input extremely in each pole voltage relative value respectively with institute
State ground reference to be compared, a digital signal level is exported respectively according to respective comparative result；Logic judgment module, uses
In the two digital signal levels described Mike poles of identification according to the described second identification submodule output and described earth polar.
In an embodiment of the present invention, this security authentication module can be also used for drm license information is modified.
In an embodiment of the present invention, this drm protection device also includes memory expansion module, for storing drm licensing.
A kind of drm protection system, including aforesaid drm protection device and audio frequency apparatus, described audio frequency apparatus passes through sound
Frequency interface is connected with described drm protection device, for preserving digital media file and using Digital Media according to drm authentication result
File；Described drm protection device, for preserving drm licensing and certification request being authenticated.
A kind of drm method for using license, comprising: drm protection device and audio frequency apparatus connect, wherein said drm protection
Device includes security authentication module and signal processing module；Audio frequency apparatus sends certification request information to institute by audio signal
State signal processing module；Described signal processing module is converted to data signal the audio signal receiving, and is sent to described peace
Full authentication module；Described security authentication module is authenticated with the certification request information being received using drm licensing, and handle is recognized
Card result is sent to described signal processing module；Described information processing module is converted to audio-frequency information the authentication result being received
Export described audio frequency apparatus；Described audio frequency apparatus uses digital media information according to described authentication result.
In an embodiment of the present invention, drm protection device and audio frequency apparatus connect and include: to Mike pole in COBBAIF and
Earth polar is identified, and audio signal transmitting element is docked with the Mike pole identified, by ground potential and the earth polar pair identified
Connect, audio signal reception unit is docked with the sound channel pole of COBBAIF；
In an embodiment of the present invention, the numeral that will treat to send to described audio frequency apparatus using current mode D/A converter module
Signal is converted to audio signal.
In an embodiment of the present invention, described current mode D/A converter module is by taking out from the Mike pole of described COBBAIF
The audio signal that the mode of obtaining current will convert into sends to described audio frequency apparatus.
In an embodiment of the present invention, Mike pole and earth polar in COBBAIF are identified, audio signal are sent single
Unit is docked with the Mike pole identified, the method that ground potential is docked with the earth polar identified includes: obtains described audio frequency apparatus
Open recording channel after, in its COBBAIF a pair of audio input extremely in each pole electric signal；Defeated according to the pair of audio frequency
In entering extremely, the electric signal of each pole identifies described Mike pole and earth polar；Will be extremely right with described Mike for described audio signal transmitting element
Connect, ground potential is docked with described earth polar.
In an embodiment of the present invention, obtain the pair of audio input extremely in the method for electric signal of each pole be: in institute
State and set up current channel between a pair of audio input pole, ground reference is accessed in the node of described current channel, obtain institute
State a pair of audio input extremely in each pole with respect to described ground reference voltage relative value.
In an embodiment of the present invention, according to the pair of audio input extremely in each pole electric signal identification Mike pole and ground
The method of pole is: by the pair of audio input extremely in the voltage relative value of each pole compared with described ground reference respectively
Relatively, a digital signal level is respectively obtained according to respective comparative result；According to the two digital signal level identifications obtaining
Mike pole and described earth polar.
In an embodiment of the present invention, also include downloading digital media file and drm license file, described Digital Media
File is saved on audio frequency apparatus, and described drm licensing exports storage in drm protection device by ciphertext form.
In an embodiment of the present invention, the drm literary composition after authentication result being sent to described signal processing module, to storage
Part is modified.
The beneficial effects of the present invention is, drm protection device connects mobile device, drm licensing energy by audio frequency apparatus
Enough computers of not binding use, and can solve the problem that mobile device does not have usb interface can not use drm licensing, effective protection
Digital rights information.Meanwhile, before entering row data communication using COBBAIF, first Mike pole and earth polar in COBBAIF are entered
Row identification is so that the present invention being capable of more preferably compatible existing different COBBAIF.
Brief description
The schematic diagram of the drm protection device that Fig. 1 provides for the technical program embodiment；
Fig. 2 is the schematic diagram of signal processing module in drm protection device shown in Fig. 1；
Fig. 3 is the schematic diagram of the control module in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar；
Fig. 4 is another schematic diagram of the control module in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar；
Fig. 5 is another schematic diagram of the control module in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar；
Fig. 6 is the schematic diagram of the first audio signal modular converter in signal processing module shown in Fig. 2；
Fig. 7 is the schematic diagram of the second audio signal modular converter in signal processing module shown in Fig. 2；
The schematic diagram of the drm protection system that Fig. 8 provides for the technical program embodiment；
Fig. 9 is the flow chart of drm protection system drm method for using license shown in Fig. 8；
Figure 10 is the flow chart of the signal processing method of signal processing module shown in Fig. 8.
Specific embodiment
The central scope of the present invention is that drm protection device is communicated by COBBAIF with audio frequency apparatus, realizes mobile whole
End is equally useful drm licensing in the case of not having usb interface and uses digital media information；Enter line number using COBBAIF
Before communication, first Mike pole and earth polar in COBBAIF are identified, then the audio signal in external equipment are sent single
Unit is docked with the Mike pole identified, the ground potential of external equipment is docked with the earth polar identified, after correct docking, in conjunction with
Digital-to-analogue/analog-to-digital conversion enters row data communication between external equipment and audio frequency apparatus, enables payment devices universal different
Use on audio frequency apparatus.
As shown in figure 1, the schematic diagram of the drm protection device providing for the technical program embodiment；This drm protection device bag
Include security authentication module 1 and signal processing module 3；Described signal processing module 3, is connected to security authentication module 1, for handle
The audio signal receiving is converted into data signal and exports described security authentication module 1, and handle connects from security authentication module 1
The data signal received is converted to audio signal and exports audio frequency apparatus；Described security authentication module 1, for receiving certification request letter
Cease and be authenticated using drm licensing, authentication result is sent to described signal processing module 3.Described drm protection device can
To be powered using power module 4；Wherein, described audio frequency apparatus can include the movement such as mobile phone, notebook, panel computer eventually
End equipment.When being authenticated using drm protection device, signal processing module 3 receives the certification request letter that audio frequency apparatus sends
Breath, described certification request information passes through audio signal transmission, and (certification please for the audio signal of described 3 receptions of signal processing module
Seek information) be converted to the certification request information of data signal and export in described security authentication module 1；Described safety certification mould
Block 1 is authenticated to certification request information using the drm license file of storage, and authentication result is exported at described signal
In reason module 3；Authentication result is converted to audio signal by described signal processing module 3, is then sent to institute by COBBAIF
State in audio frequency apparatus, for audio frequency apparatus, digital media file is used according to authentication result.Digital media file can be in different sounds
Copying and saving on frequency equipment, it is possible to use same drm licensing is authenticated using digital media file.
So, the use of drm licensing can be independent of computer, can realize certification in the terminal device being convenient for carrying,
The connection of usb interface can not be passed through and realize certification, the terminal device typically without usb interface is realized drm certification, and, no
Can be verified with same drm protection file with the digital media file on equipment.
In another embodiment, described security authentication module 1 can also be according to the storage of drm license management protocol modification
Drm license information, limits, including according to Digital Media, the time using, or allows number of times of opening etc., enters according to the rules
Row delete, drm licensing lost efficacy after be automatically deleted wait operate.
In another embodiment, described drm protection device can also include memory expansion unit 2, described memory expansion mould
Block is used for storing drm license file；So, described drm protection device can preserve the larger drm license file of file,
Multiple drm license files can also be preserved simultaneously.Improve the different digital media files of drm protection device adaptation to be authenticated
Demand.
As shown in Fig. 2 the schematic diagram for signal processing module in drm protection device shown in Fig. 1；This signal processing module bag
Include the control module 31 in audio interface microphone pole and earth polar, audio signal reception unit 32, the first audio signal modular converter 33,
Second audio signal modular converter 34 and audio signal transmitting element 35.The control module 31 in audio interface microphone pole and earth polar is used
Be identified in the Mike pole to COBBAIF and earth polar, after identification, by the ground potential of signal processing module equipment of itself with
The earth polar docking identifying, with the ground reference of unified signal processing module and audio frequency apparatus, by audio signal transmitting element
35 are docked with the Mike pole identified, to set up the sendaisle that signal processing module sends data to audio frequency apparatus.Due to sound
In frequency interface, the position of sound channel pole (including left/right/momo sound channel) is usually fixed, and therefore, the audio frequency in external equipment is believed
The sound channel pole of number receiving unit and COBBAIF, after recording channel opened by audio frequency apparatus, can be automatically performed docking, set up letter
Number processing module is from the receiving channel of audio frequency apparatus receiving data.Audio signal reception unit 32 is used for the sound by COBBAIF
Road pole receives the audio signal from audio frequency apparatus, by the audio signal transmission receiving to the first audio signal modular converter 33,
First audio signal modular converter 33 is used for for this audio signal from audio frequency apparatus being converted to data signal, the second audio frequency letter
Number modular converter 34 is used for treating that the data signal sending to audio frequency apparatus is converted to audio signal, and audio signal sends single 35 use
In the Mike pole by COBBAIF by the audio signal being converted into via the second audio signal modular converter 34 to audio frequency apparatus
Send.
As shown in figure 3, being the one of the control module 1 in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar
Plant implementation.Including acquisition module 131, identification module 132 and port handover module 133.Wherein, acquisition module 131 is used for
Obtain audio frequency apparatus open recording channel after, in its COBBAIF a pair of audio input extremely in each pole electric signal, identification module
132 are used for the electric signal identification Mike pole at the two poles of the earth getting according to acquisition module 131 and earth polar, port handover module 133, use
After identification module 132 identifies Mike pole and earth polar, automatically by the ground potential of signal processing module equipment of itself and identification
The earth polar docking going out, with the ground reference of unified signal processing module and audio frequency apparatus, automatically by audio signal transmitting element
35 with the Mike pole identified.
As shown in figure 4, being the another of the control module 1 in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar
A kind of implementation.Including voltage domain modular converter 141 and the first identification submodule 142.Voltage domain modular converter 141 is by existing
After having audio frequency apparatus to open recording channel, Mike has this precondition of voltage higher than earth polar, in its COBBAIF
This pair of audio input pole between set up current channel, ground reference is accessed in the node of this current channel, obtain should
A pair of audio input extremely in each pole with respect to this ground reference voltage relative value, wherein ground reference refers to outside and sets
Standby, control module common ground, because audio frequency apparatus is opened behind recording channel, Mike has the voltage higher than earth polar, because
This, on this current channel that voltage domain modular converter 141 is set up, electric current must be to flow to earth polar, reference ground from Mike pole
Current potential is 0, then Mike pole is set on the occasion of earth polar is with respect to this reference ground with respect to the voltage relative value one of this ground reference
The voltage relative value one of current potential is set to negative value, therefore, voltage domain modular converter 141 output be a positive voltage relative value and
One negative voltage relative value.First identification submodule 142 identifies Mike pole by the positive negative characteristic of detection voltage relative value
And earth polar, positive one extremely Mike pole, negative one extremely earth polar.
As shown in figure 5, being the another of the control module 1 in signal processing module sound intermediate frequency interface Mike pole shown in Fig. 2 and earth polar
A kind of implementation.The place that this embodiment is different from embodiment illustrated in fig. 4 is, identifies submodule 141 using second and patrols
Collect the first identification submodule 152 that judge module 152 substitutes embodiment illustrated in fig. 4, i.e. this embodiment sound intermediate frequency interface Mike pole
Include voltage domain modular converter 141, second identification submodule 151 and logic judgment module 152 with the control module 1 in earth polar.Electricity
Pressure domain modular converter 141 is still opened behind recording channel by existing audio frequency apparatus, Mike have higher than earth polar voltage this
One precondition, sets up current channel between a pair of audio input pole of this in its COBBAIF, ground reference is accessed
In the node of this current channel, obtain this pair of audio input extremely in each pole with respect to this ground reference voltage relative value.
Second identification submodule 151 includes two comparison modules, the first comparison module 151a and the second comparison module 151b, and first compares mould
Block 151a is used for the voltage relative value that exports voltage domain modular converter 141 and is compared with ground reference, according to comparing
Result exports a digital signal level；Second comparison module 151b is used for another voltage exporting voltage domain modular converter 141
Relative value is compared with ground reference, exports another digital signal level according to comparative result.Logic judgment module 152 is used
In the digital signal level identification Mike pole according to the first comparison module 151a and the second comparison module 151b output and earth polar.False
If the comparison rule of the first comparison module 151a and the second comparison module 151b is, when voltage relative value is more than ground reference
When, output level 1, when voltage relative value is less than ground reference, output level 0 (in practical application it is also possible to contrary), that
When the first comparison module 151a and the second comparison module 151b output is when being all level 0, show that audio frequency apparatus is not also opened
The plug of recording channel or external equipment is also not inserted in COBBAIF, when any one export when being level 1, show
Audio frequency apparatus has turned on recording channel, and the pole corresponding to level 1 is identified as Mike pole by logic judgment module 152, by level 0
A corresponding pole is identified as earth polar.
As shown in fig. 6, a kind of embodiment party for the first audio signal modular converter 33 in signal processing module shown in Fig. 2
Formula.Including DC converting module 331 and comparison module 332.This embodiment is applied to a channel transfer data, is also applied for two
Individual sound channel simultaneous transmission data, when using two sound channel simultaneous transmission data, the data volume of its same time period transmission is to make
Twice with a channel transfer.Corresponding to the sound channel number in COBBAIF, in comparison module 332, set the son of corresponding number
Comparison module, the present embodiment sets the sub- comparison module 332a of the corresponding L channel and sub- comparison module 332b of corresponding R channel.
It is usually ac voltage signal due to export from the sound channel pole of COBBAIF, therefore, DC converting module 331 is used for audio frequency
The audio signal conversion direct current signal of the alternating voltage form that signal receiving unit 32 receives from the sound channel pole of COBBAIF.Preferably
, DC converting module 331 carries and carries out clamped function to input signal centered level, makes the exchange letter that left and right acoustic channels are original
Number, become the signal having certain DC component, concrete mode may is that on the ac voltage signal of sound channel pole output, superposition
Positive DC voltage vdc_a, preferred vdc_a are the half of supply voltage vdd, and two sound channel poles of COBBAIF are connected one
Resistance is to ground, the resistance of connected resistance preferably 32 ω or 16 ω.The son of sub- comparison module 332a and corresponding R channel compares
The direct current signal that module 332b is used for being converted into DC converting module 331 is compared with the above-mentioned DC voltage vdc_a being superimposed
Relatively, send comparative result, if the direct current signal that DC converting module 31 is converted into is more than vdc_a, then export high level, otherwise
Output low level.
As shown in fig. 7, a kind of embodiment party for the second audio signal modular converter 34 in signal processing module shown in Fig. 2
Formula.Second audio signal modular converter 34 adopts sink current type dac, its according to treating the data signal that sends to audio frequency apparatus, from
The electric current of change is extracted in the Mike pole of COBBAIF, because in existing COBBAIF, Mike extremely goes up and would generally connect a resistance, when
When the electric current extracting changes, the voltage that Mike extremely goes up, with change, by changing the voltage that Mike extremely goes up, realizes numeral letter
Number to audio signal conversion, be simultaneously achieved audio signal from Mike pole input audio frequency apparatus.
As described in Figure 8, the schematic diagram of the drm protection system providing for the technical program embodiment；Described drm protection system
Including above-described one of which drm protection device and audio frequency apparatus, described audio frequency apparatus pass through COBBAIF with described
Drm protection device connects, for preserving digital media file and using digital media file according to drm authentication result；Described drm
Protection device, for preserving drm licensing and certification request being authenticated.
As shown in figure 9, being drm method for using license flow chart in drm protection system shown in Fig. 8, its flow process includes:
S00, drm protection device and audio frequency apparatus are connected by signal processing module；
S02, audio frequency apparatus send certification request information, by itself software, certification request information are converted to audio signal
Export the signal processing module of described drm protection device；
S04, signal processing module 3 receive described certification request information, and described certification request information is converted to numeral letter
Number, and export in described security authentication module 1；
S06, security authentication module 1, using the drm license file of storage, are recognized to the certification request information being received
Card；Wherein, described drm license file can be stored in the storage element of security authentication module 1 or storage
In memory expansion module 2；
S08,1 authentication result of security authentication module are sent in described signal processing module 3；
S10,3 authentication results of signal processing module are converted to audio signal and are sent in audio frequency apparatus；
S12, audio frequency apparatus use digital media file according to authentication result.
As shown in Figure 10, be the signal processing method of signal processing module shown in Fig. 8 flow chart；Concrete steps include:
The control module 1 of s000, audio interface microphone pole and earth polar is identified to the Mike pole of COBBAIF and earth polar,
After identification, the ground potential of signal processing module equipment of itself is docked with the earth polar identified, with unified signal processing module
With the ground reference of audio frequency apparatus, audio signal transmitting element 5 is docked with the Mike pole identified, set to audio frequency with setting up
Preparation send the passage of data.
In receiving channel:
S001, audio signal reception unit 2 receive the audio signal from audio frequency apparatus by the sound channel pole of COBBAIF,
By the audio signal transmission receiving to the first audio signal modular converter 3.Should be from the audio signal of audio frequency apparatus via audio frequency
Obtain after equipment framing, coding and digital-to-analogue conversion.
This audio signal from audio frequency apparatus is converted to data signal by s002, the first audio signal modular converter 3, will
Data signal after conversion exports to decoder module 7.It is preferred that passing through to filter burr module pair before transmitting to decoder module 7
Data signal after conversion.
The data signal that s003, decoder module 7 are converted into the audio signal from audio frequency apparatus is decoded, and will solve
Digital data transmission after code is to solution frame module 9.
Decoded data signal carries out solving frame to decoder module 7 for s004, solution frame module 9, the data that will obtain after solution frame
Enter row cache, or send and carry out Business Processing to other processing modules.
On sendaisle:
S011, framing module 8 are taken out from caching or are obtained the number treating to send to audio frequency apparatus from other processing modules
To this, word signal, treats that the data signal sending to audio frequency apparatus carries out framing, the data signal after framing is inputted to coding mould
Block 6.
The data signal treating to send to audio frequency apparatus through framing that s012, coding module 6 export to framing module 8 is entered
Row coding, the data signal after coding is inputted to the second audio signal modular converter 4.
S013, the second audio signal modular converter 4 are by the encoded data signal conversion treated and send to audio frequency apparatus
For audio signal, transmit to audio signal transmitting element 5.
The Mike pole that s014, audio signal transmitting element 5 pass through COBBAIF will be via the second audio signal modular converter 4
The audio signal being converted into sends to audio frequency apparatus.After audio frequency apparatus receives this audio signal, carry out analog-to-digital conversion, decoding, solution
Frame operates.
Above content is to further describe it is impossible to assert this with reference to specific embodiment is made for the present invention
Bright it is embodied as being confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of present inventive concept, some simple deduction or replace can also be made, all should be considered as belonging to the protection of the present invention
Scope.
Claims (16)
1. a kind of drm protection device, including security authentication module and signal processing module, is connected by described signal processing module
Connect drm protection device and audio frequency apparatus；Wherein,
Described signal processing module, is connected to security authentication module, for receiving audio signal and being converted into data signal output
To described security authentication module, and the data signal receiving from security authentication module is converted to audio signal exports audio frequency
Equipment；Described signal processing module include the control module in audio interface microphone pole and earth polar, audio signal reception unit, first
Audio signal modular converter, the second audio signal modular converter and audio signal transmitting element, described audio signal reception unit
Dock with the sound channel pole of COBBAIF, wherein,
The control module in described audio interface microphone pole and earth polar is used for the Mike pole of described COBBAIF and earth polar are known
Not, described audio signal transmitting element is docked with the Mike pole identified, ground potential is docked with the earth polar identified；
Described audio signal reception unit is used for receiving the sound from described audio frequency apparatus by the sound channel pole of described COBBAIF
Frequency signal；
Described first audio signal modular converter is used for for the audio signal from described audio frequency apparatus being converted to data signal；
Described second audio signal modular converter is used for for the data signal treating to send to described audio frequency apparatus being converted to audio frequency letter
Number；
Described audio signal transmitting element is used for treating to the transmission of described audio frequency apparatus by the Mike pole of described COBBAIF
The audio signal that data signal is converted into sends to described audio frequency apparatus；
Described security authentication module, for storing drm licensing, and receives certification request information and uses drm licensing pair
The certification request information being received is authenticated, and authentication result is sent to described signal processing module.
2. drm protection device as claimed in claim 1 is it is characterised in that described second audio signal modular converter is electric current
Type D/A converter module.
3. drm protection device as claimed in claim 2 is it is characterised in that described current mode D/A converter module is passed through from institute
The Mike pole stating COBBAIF is extracted the audio signal that will convert into of mode of electric current and is sent to described audio frequency apparatus.
4. drm protection device as claimed in claim 1 is it is characterised in that the control in described audio interface microphone pole and earth polar
Module includes:
Acquisition module, for obtaining described audio frequency apparatus after opening recording channel, a pair of audio input pole in its COBBAIF
In each pole electric signal；
Identification module, for according to the pair of audio input extremely in the electric signal of each pole identify described Mike pole and earth polar；
Port handover module, after identifying Mike pole and earth polar for described identification module, described audio signal is sent single
First and described Mike pole is docked, and ground potential is docked with described earth polar.
5. drm protection device as claimed in claim 4, it is characterised in that described acquisition module is voltage domain modular converter, is used
In setting up current channel between the pair of audio input pole, ground reference is accessed in the node of described current channel,
Obtain the pair of audio input extremely in each pole with respect to described ground reference voltage relative value.
6. drm protection device as claimed in claim 4 is it is characterised in that described identification module includes:
First identification submodule, for by the pair of audio input extremely in each pole voltage relative value respectively with ground reference
It is compared, a digital signal level is exported respectively according to respective comparative result；
Logic judgment module, for identifying described Mike pole according to two digital signal levels of the described first identification submodule output
With described earth polar.
7. the drm protection device as described in any one of claim 1-6 is it is characterised in that described security authentication module is additionally operable to
Drm license information is modified.
8. the drm protection device as described in any one of claim 1-6 is it is characterised in that in described drm protection device also includes
Deposit expansion module, described memory expansion module is used for storing drm licensing.
9. a kind of drm method for using license, comprising:
Drm protection device is identified to Mike pole and earth polar in COBBAIF, and by audio signal transmitting element with identify
Mike pole docking, ground potential is docked with the earth polar identified, by the sound channel pole of audio signal reception unit and COBBAIF
Docking；Wherein said drm protection device includes security authentication module and signal processing module；
Audio frequency apparatus sends certification request information to described signal processing module by audio signal；
Described signal processing module is converted to data signal the audio signal receiving, and is sent to described security authentication module；
Described security authentication module is authenticated with the certification request information being received using drm licensing, and authentication result
It is sent to described signal processing module；
Described signal processing module is converted to audio-frequency information the authentication result being received and exports described audio frequency apparatus；
Described audio frequency apparatus uses digital media information according to described authentication result.
10. drm method for using license as claimed in claim 9 is it is characterised in that described signal processing module is reception
Authentication result is converted to audio-frequency information and exports described audio frequency apparatus is will to be treated to described sound using current mode D/A converter module
The data signal that frequency equipment sends is converted to audio signal.
11. drm method for using licenses as claimed in claim 10 are it is characterised in that described current mode D/A converter module
The audio signal that be will convert into by way of extracting electric current from the Mike pole of COBBAIF sends to described audio frequency apparatus.
12. drm method for using licenses as claimed in claim 9 are it is characterised in that to Mike pole and earth polar in COBBAIF
It is identified, audio signal transmitting element is docked with the Mike pole identified, ground potential is docked with the earth polar identified
Method includes:
Obtain described audio frequency apparatus open recording channel after, in its COBBAIF a pair of audio input extremely in each pole telecommunications
Number；
According to the pair of audio input extremely in the electric signal of each pole identify described Mike pole and earth polar；
Described audio signal transmitting element is docked with described Mike pole, ground potential is docked with described earth polar.
13. drm method for using licenses as claimed in claim 12 are it is characterised in that obtain the pair of audio input pole
In the method for electric signal of each pole be: set up current channel between the pair of audio input pole, ground reference accessed
In the node of described current channel, obtain the pair of audio input extremely in each pole with respect to described ground reference voltage phase
To value.
14. drm method for using licenses as claimed in claim 12 are it is characterised in that according to the pair of audio input pole
In the electric signal of each pole identify that the method in Mike pole and earth polar is:
By the pair of audio input extremely in the voltage relative value of each pole be compared with ground reference respectively, according to respective
Comparative result respectively obtains a digital signal level；
Two digital signal levels according to obtaining identify described Mike pole and described earth polar.
The 15. drm method for using licenses as described in any one of claim 9-14 are it is characterised in that also include downloading numeral
Media file and drm license file, wherein, described digital media file is saved on audio frequency apparatus, and described drm licensing leads to
Cross ciphertext form and be sent to storage in drm protection device.
The 16. drm method for using licenses as described in any one of claim 9-14 are it is characterised in that sending out authentication result
After delivering to described signal processing module, the drm file of storage is modified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210126842.2A CN103377323B (en) | 2012-04-26 | 2012-04-26 | Digital rights management (DRM) protecting device and DRM license using method |
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| CN201210126842.2A CN103377323B (en) | 2012-04-26 | 2012-04-26 | Digital rights management (DRM) protecting device and DRM license using method |
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| CN103377323B true CN103377323B (en) | 2017-01-25 |
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| US7484102B2 (en) * | 2004-09-07 | 2009-01-27 | Microsoft Corporation | Securing audio-based access to application data |
| CN102098159A (en) * | 2010-07-28 | 2011-06-15 | 胡旭光 | Secret key device and method for mobile phone |
| CN202177904U (en) * | 2011-07-08 | 2012-03-28 | 国民技术股份有限公司 | Intelligent encrypted key based on audio interface |
| CN102255730A (en) * | 2011-07-11 | 2011-11-23 | 吴沙林 | Digital certificate safety lock device and digital certificate authentication system and method |
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