WO2002099654A1 - Content reproduction apparatus - Google Patents
Content reproduction apparatus Download PDFInfo
- Publication number
- WO2002099654A1 WO2002099654A1 PCT/JP2002/005322 JP0205322W WO02099654A1 WO 2002099654 A1 WO2002099654 A1 WO 2002099654A1 JP 0205322 W JP0205322 W JP 0205322W WO 02099654 A1 WO02099654 A1 WO 02099654A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- time
- cpu
- content
- audio data
- turned
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2135—Metering
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2137—Time limited access, e.g. to a computer or data
Definitions
- the present invention relates to a content reproducing apparatus that reproduces content such as music and images, and more particularly to, for example, a content reproducing apparatus that reproduces content having a valid period.
- the validity period of the content is managed by using the calendar function of the apparatus itself.
- the date of the device's own power calendar is compared with the validity period of the content, and when the calendar date of the device itself exceeds the validity period of the content, the content is invalidated (cannot be reproduced).
- a main object of the present invention is to provide a novel content reproducing apparatus.
- Another object of the present invention is to provide a content reproducing apparatus capable of reliably preventing illegal use of content whose validity period has elapsed.
- a content reproducing device is a content reproducing device for reproducing content having a validity period, wherein a first measuring means for measuring a first time from an ON operation to an OFF operation of a main power supply; Second measuring means for measuring a second time until the next ON operation, total sum calculating means for calculating a sum of the first time and the second time, and And invalidating the content reproduction when the calculated sum exceeds the validity period.
- the first measuring means measures a first time from a main power on operation to an off operation
- the second measuring means measures a second time from a main power off operation to an on operation.
- the sum calculating means calculates the sum of the first time and the second time, and when the calculated sum exceeds the validity period, the invalidating means invalidates the content.
- a backup power supply is further provided.
- the second measuring means includes a counting means driven by the backup power supply and counting time, a count value by the counting means when the OFF operation is performed, and a counting means by which the next ON operation is performed. Calculating means for calculating the second time based on the count value of the second time.
- the second measuring means comprises: a capacitor in which electric charges are stored; a discharging means for discharging electric charges stored in the capacitor in response to an OFF operation; and a response means in response to an ON operation. It includes a detecting means for detecting the terminal voltage of the capacity, and a calculating means for calculating the second time based on the detected terminal voltage.
- the time from the ON operation to the OFF operation of the main power supply and the time from the OFF operation to the next ON operation are sequentially measured, and the effective period of the content is determined based on the cumulative value of the measured times.
- Manage Therefore, unlike the above-described prior art in which the validity period of the content is managed based on a calendar date that can be arbitrarily set, there is an effect that unauthorized use of the content whose validity period has elapsed can be reliably prevented.
- FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of the present invention
- FIG. 2 is an illustrative view for explaining a method of managing a content validity period in the embodiment of FIG. 1
- 3 is a flowchart showing the operation of the CPU in the embodiment of FIG. 1
- FIG. 4 is a flowchart showing the operation of the CPU following the flowchart of FIG. 3
- FIG. FIG. 4 is a flowchart different from that of FIG.
- FIG. 6 is a block diagram showing a schematic configuration of a second embodiment of the present invention.
- FIG. 7 is an illustrative view showing details of a timing circuit in the embodiment of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the content reproducing apparatus 10 of this embodiment shown in FIG. 1 is, for example, a portable type, and reproduces audio data such as sound and music recorded as contents in a memory card 12.
- the memory card 12 is a removable recording medium, and is electrically connected to a CPU (Central Processing Unit) 18 via a memory interface 16 when the memory card 12 is inserted into the slot 14.
- the audio data is recorded on the memory card 12 in a state of being compressed in a predetermined compression format such as MP3 (MPEG-1 AUDIO Layer 3) or AAC (MPEG-2 Advanced Audio Coding).
- the memory card 12 also records decoding software (decoding program) for expanding the compressed audio data.
- the CPU 18 transmits audio data and decoding software from the memory card 12.
- the captured audio data and the decoding software are supplied to a DSP (Digital Signal Processor) 22.
- the DSP 22 decompresses (decodes) the audio data using the decoding software supplied from the CPU 18 and inputs the decompressed audio data to the DZA converter 24.
- the zero-to-eight converter 24 converts the input audio data into an analog audio signal.
- the converted audio signal is amplified by the audio amplifier 26 and then input to the headphone 30 via the output terminal 28, whereby the audio (or music) is reproduced.
- a stop key (not shown) constituting the operation key 20 may be pressed.
- a playback stop command is given from the operation key 20 to the CPU 18, whereby the CPU 18 controls the DSP 22 to stop the playback operation.
- an RTC (Real Time Clock) circuit 32 for measuring the current time is connected to the CPU 18, and the CPU 18 implements a calendar function based on the current time data supplied from the RTC circuit 32. Further, a liquid crystal display 34 is connected to the CPU 18, and various information corresponding to the operation of the CPU 18 is displayed on the display 34. Further, the CPU 18 is connected with an EEPROM (Electrically Erasable Programmable ROM) 36 and a USB (Universal Serial Bus) terminal 40 via an external interface 38.
- EEPROM Electrical Erasable Programmable ROM
- These circuits including the CPU 18 are driven by the power supply voltage Vcc supplied from the power supply circuit 44 when the main power switch 42 is turned on. Then, the power supply circuit 44 generates the power supply voltage Vcc based on the DC voltage DC V supplied from the battery 46. However, since the RTC circuit 32 needs to be driven even when the power switch 42 is turned off (OFF), the backup battery 48 is used as the power supply.
- the operation of turning off the main power switch 42 is controlled by the CPU 18. That is, the CPU 18 turns off the main power switch 42 when a power-off command is given from the operation key 20, specifically, when the power-off switch constituting the operation key 20 is pressed.
- audio data can be downloaded from the Internet. That is, the personal computer (not shown) accesses the Internet and the desired audio data is temporarily downloaded to the personal computer. After this download, a personal computer (strictly speaking, the USB terminal of a personal computer) is connected to the USB terminal 40, and the audio data downloaded to the personal computer is transferred to the USB terminal 40 and the external interface 38. To the CPU 18 via. Accordingly, the CPU 18 records the transferred audio data on the memory card 12 via the memory interface 16.
- audio data can also be imported from CDs (Co-act disks) or DATs (Digital Audio Tape).
- the content reproducing apparatus 10 of this embodiment when reproducing data having a validity period Ta, such as audio data for trial listening, invalidates the data whose validity period Ta has elapsed (playback is impossible). ).
- the so-called power-off time Toff from the time point t 0 ff when the main power switch 42 is turned off to the time point ton when the main power switch 42 is turned on again are sequentially measured.
- the sum of the power-on time Ton and the power-off time Toff from this reference date to (total Value) Calculate T.
- the calculated total T is compared with the valid period Ta of the audio data, and when the total T exceeds the valid period Ta, the audio data is invalidated.
- the data relating to the reference date to is stored in the above-mentioned EEPROM 36 in a state associated with the audio data.
- the CPU 18 performs a process according to the flow charts of FIGS. Note that a control program for controlling the operation of the CPU 18 according to these processes is stored in a memory (not shown).
- the CPU 18 sends the current time (time when the main power switch 42 is turned on) ton from the RTC circuit 32 in step S1. Get the data. Then, in step S3, data regarding the time toff when the main power switch 42 was turned off last time is acquired from the EE PROM 36.
- data of toff 0 is stored in the EEPROM 36 as a data regarding the time toff.
- the CPU 18 calculates the power-off time Toff from the time difference (ton-toff) between these times ton and toff in step S5. Then, in step S7, the data regarding the above-mentioned sum T is obtained from the EEPROM 36. The validity period Is stored in the memory 36 when the audio data having the symbol T is recorded in the memory card 12. Then, in step S9, the sum of the sum ⁇ obtained in step S7 and the power-off time Toff calculated in step S5 is obtained, and the obtained sum is recognized as a new total sum.
- the counter referred to here is completely separate from the above-described RTC circuit 32, and may be configured by software by the CPU 18 or may be configured by a hardware circuit.
- step S15 the CPU 18 determines whether or not the above-described power-off command has been given from the operation key 20. If the power-off command has not been given, the CPU 18 proceeds to step S17. It is determined whether or not a playback start command has been given from key 20. In step S17, when a reproduction start command is given, the CPU 18 proceeds to step S19 shown in the flowchart of FIG.
- step S19 the CPU 18 determines whether or not the audio data to be reproduced has a valid period Ta. If the audio data to be reproduced has a validity period Ta, data on the validity period Ta is acquired from the memory card 12 in step S21. Then, in step S23, the above total T is compared with the valid period Ta, and if the total T exceeds the valid period Ta, the process proceeds to step S25, where the audio data is determined to be unreproducible. I do. Specifically, a message to the effect that the validity period Ta has already passed is displayed on the display 34 without reproducing the audio data. After the processing in step S25, the CPU 18 returns to step S15 in FIG.
- step S29 it is determined whether or not the above-described playback stop instruction has been given from the operation keys 20, and if the playback stop instruction has not been given, in step S31, the playback of the audio data is started. It is determined whether the process has been completed. In step S31, if the playback of the audio Returns to step S29, and when the reproduction is completed, returns to step S15 in FIG. When a reproduction stop command is given from the operation key 20 in step S29, the CPU 18 proceeds to step S33, stops the reproduction operation here, and returns to step S15.
- step S15 when receiving the power-off command, the CPU 18 proceeds to step S35 shown in FIG. Then, in step S35, the current time data relating to the current time (time at which the power-off command is received) toff is acquired from the RTC circuit 32, and the acquired data relating to the time toff is converted into the EE PROM in step S37. Store in 36.
- step S39 the sum of the above total T and the power-on time Ton measured up to the present time (when the power-off command is received) is obtained, and the obtained sum is recognized as a new total T. Then, after storing the data relating to the sum T in the EE PROM 36 in step S41, the main power switch 42 is actually turned off in step S43, and a series of operations ends.
- the power-on time Ton and the power-off time Toff are sequentially measured, and based on the total T of the measured times Ton and Toff, the audio is reproduced.
- the power-off time Toff is calculated based on the data on the times ton and toff obtained from the RTC circuit 32, the power-off time is apparently manipulated by the RTC circuit 32 (illegally). It seems that the time Toff can be changed arbitrarily. However, when the power is turned off, the RTC circuit 32 cannot be operated. Therefore, even if the time measured by the RTC circuit 32 is not accurate, the power off time Toff can be accurately measured.
- the content reproduction device 10 of the second embodiment differs from the configuration of the first embodiment shown in FIG. Instead of this, a timing circuit 50 connected to the CPU 18 is provided.
- the other configuration is the same as that of the first embodiment, and thus the same reference numerals are given to the same parts as those in FIG. 1 and the detailed description is omitted.
- the power-off time Toff is measured by utilizing the discharge characteristics of a capacity 52, which will be described later, that constitutes the clock circuit 50. This is different from the first embodiment in which the power-off time Toff is measured using the times t on and t off measured by the circuit 32.
- the above-mentioned capacity 52 is connected between circuit voltage Vcc and ground potential (GND) via switch circuit 54.
- the ON / OFF operation of the switch circuit 54 is controlled by the CPU 18.
- a resistor 56 is connected to both ends of the capacitor 52. Further, the voltage V between both ends of the resistor 56 (capacitor 52) is input to the AZD converter 60 via the buffer amplifier 58, and the data digitized by the A / D converter 60 is supplied to the CPU 18. Is performed.
- V E-exp (-t / CR) [V] '"(1)
- C is the capacity of the capacitor 52, and R is the resistance of the resistor 54.
- the input impedance of the buffer amplifier 58 is assumed to be infinite ( ⁇ ).
- Equation 1 CR (logE-logV) [s] ⁇ ' ⁇ (2)
- the power-off time Toff can be measured with a relatively simple circuit configuration as shown in FIG. 7 without using the RTC circuit 32 described above. It is desirable to use a large capacity C as the capacity 52. It is also desirable to use a resistor having a large resistance value R as the resistor 56. Note that the discharge time t may be obtained under the condition of spontaneous discharge without using the resistor 56.
- the present invention may be applied to an apparatus that plays back other content such as image data.
- the content reproduction device 10 does not need to be portable, and may be, for example, an evening device that is installed on a desk or a predetermined rack.
- the memory card 12 As a medium for recording the audio data, the memory card 12 is used, but it is not limited to this.
- another recording medium such as a magneto-optical disk or a magnetic tape may be used.
- step S57 of FIG. 5 an error message is displayed on the display 36.
- a buzzer is used.
- the error message may be output in an audible manner, such as sounding or outputting a sound.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7001613A KR20030022881A (ko) | 2001-06-04 | 2002-05-30 | 콘텐츠 재생 장치 |
US10/343,328 US6837430B2 (en) | 2001-06-04 | 2002-05-30 | Content reproduction apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001167579A JP3754325B2 (ja) | 2001-06-04 | 2001-06-04 | コンテンツ再生装置 |
JP2001-167579 | 2001-06-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002099654A1 true WO2002099654A1 (en) | 2002-12-12 |
Family
ID=19009946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005322 WO2002099654A1 (en) | 2001-06-04 | 2002-05-30 | Content reproduction apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US6837430B2 (ja) |
JP (1) | JP3754325B2 (ja) |
KR (1) | KR20030022881A (ja) |
WO (1) | WO2002099654A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115356B (fi) * | 2001-06-29 | 2005-04-15 | Nokia Corp | Menetelmä audiovisuaalisen informaation käsittelemiseksi elektroniikkalaitteessa, järjestelmä ja elektroniikkalaite |
FI115257B (fi) * | 2001-08-07 | 2005-03-31 | Nokia Corp | Menetelmä informaation käsittelemiseksi elektroniikkalaitteessa, järjestelmä, elektroniikkalaite ja suoritinlohko |
JP4632778B2 (ja) * | 2004-12-27 | 2011-02-16 | 京セラミタ株式会社 | 画像形成装置 |
JP5024000B2 (ja) * | 2007-11-30 | 2012-09-12 | ソニー株式会社 | 記録再生装置及びタイムコード復元方法 |
JP2009238211A (ja) * | 2008-03-07 | 2009-10-15 | Panasonic Corp | 情報処理装置、経過時間計測方法 |
US20090228640A1 (en) * | 2008-03-07 | 2009-09-10 | Kabushiki Kaisha Toshiba | Information processing apparatus and non-volatile semiconductor memory drive |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60176157A (ja) * | 1984-02-23 | 1985-09-10 | Fujitsu Ltd | タイムロツクによる機密保護方式 |
JPH03290733A (ja) * | 1990-04-09 | 1991-12-20 | Toshiba Corp | アプリケーションプログラムの貸出し期限管理装置 |
JPH05173895A (ja) * | 1991-12-20 | 1993-07-13 | Nec Corp | 記憶保持装置 |
JP2000057057A (ja) * | 1998-08-10 | 2000-02-25 | Toshiba Corp | 情報処理装置及び情報管理方法 |
JP2000242565A (ja) * | 1999-02-19 | 2000-09-08 | Nec Corp | 無線携帯端末 |
JP2001117824A (ja) * | 1999-10-15 | 2001-04-27 | Casio Comput Co Ltd | 携帯型情報端末装置およびそのプログラム記録媒体 |
JP2001147803A (ja) * | 1999-11-24 | 2001-05-29 | Casio Comput Co Ltd | 計測期間監視装置およびそのプログラム記録媒体 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4740890A (en) * | 1983-12-22 | 1988-04-26 | Software Concepts, Inc. | Software protection system with trial period usage code and unlimited use unlocking code both recorded on program storage media |
US5014234A (en) * | 1986-08-25 | 1991-05-07 | Ncr Corporation | System with software usage timer and counter for allowing limited use but preventing continued unauthorized use of protected software |
-
2001
- 2001-06-04 JP JP2001167579A patent/JP3754325B2/ja not_active Expired - Fee Related
-
2002
- 2002-05-30 WO PCT/JP2002/005322 patent/WO2002099654A1/ja active Application Filing
- 2002-05-30 KR KR10-2003-7001613A patent/KR20030022881A/ko not_active Application Discontinuation
- 2002-05-30 US US10/343,328 patent/US6837430B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60176157A (ja) * | 1984-02-23 | 1985-09-10 | Fujitsu Ltd | タイムロツクによる機密保護方式 |
JPH03290733A (ja) * | 1990-04-09 | 1991-12-20 | Toshiba Corp | アプリケーションプログラムの貸出し期限管理装置 |
JPH05173895A (ja) * | 1991-12-20 | 1993-07-13 | Nec Corp | 記憶保持装置 |
JP2000057057A (ja) * | 1998-08-10 | 2000-02-25 | Toshiba Corp | 情報処理装置及び情報管理方法 |
JP2000242565A (ja) * | 1999-02-19 | 2000-09-08 | Nec Corp | 無線携帯端末 |
JP2001117824A (ja) * | 1999-10-15 | 2001-04-27 | Casio Comput Co Ltd | 携帯型情報端末装置およびそのプログラム記録媒体 |
JP2001147803A (ja) * | 1999-11-24 | 2001-05-29 | Casio Comput Co Ltd | 計測期間監視装置およびそのプログラム記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
US20040011869A1 (en) | 2004-01-22 |
US6837430B2 (en) | 2005-01-04 |
KR20030022881A (ko) | 2003-03-17 |
JP2002358243A (ja) | 2002-12-13 |
JP3754325B2 (ja) | 2006-03-08 |
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