1. A content distribution server arranged to be connectable via a telecommunication circuit to a user terminal device, comprising:
a distribution-content storing section which stores a distribution content file subject to distribution, the distribution content file being composed of: content data; and a regulatory program for enforcing a regulation reproducing the content data, the regulatory program including a first key required for the regulation;
a key storing section for storing a second key which forms a pair with the first key;
a key generating section for generating, when receiving the terminal identification information transmitted from the user terminal device, based on the received terminal identification information and the second key stored in the key storing section, a third key including these pieces of information; and
a transmitting controller for transmitting, in response to a request from the user terminal device, to the user terminal device the distribution content file stored in the distribution-content storing section, and transmitting to the user terminal device the third key generated by the key generating section, wherein
the regulatory program is configured to:
when the distribution content file is opened on the user terminal device at least for a first time, firstly execute the regulatory program, and thereafter, reproduce the content data; and
to perform a process in which on the user terminal device, the terminal identification information based on unique information of the user terminal device is generated and is transmitted to the content distribution server, a process in which the third key transmitted from the content distribution server is received, information corresponding to the second key and the terminal identification information are each recognized from the received third key, whether the recognized second key is a key which forms a pair with the first key in the regulatory program is confirmed, and whether the recognized terminal identification information agrees with the generated terminal identification information is confirmed, and a process in which when the recognized second key is the key which forms a pair with the first key and the recognized terminal identification information agrees with the generated terminal identification information, the content data are reproduced.
2. The content distribution server according to claim 1, wherein the distribution-content storing section is stored with a plurality of distribution content files each provided with the different content data,
the regulatory program is configured such that the first key is differed depending on the content data, and is configured to transmit, upon performing a process for transmitting the terminal identification information to the content distribution server, the content identification information for identifying the content data, together with the terminal identification information,
the key storing section is stored with the content identification information and the second key which forms a pair with the first key in the regulatory program corresponding to the content data specified by the content identification information in a manner to be associated with each other,
the key generating section is configured, when receiving the terminal identification information and the content identification information transmitted from the user terminal device, to refer to data stored in the key storing section based on the received content identification information, recognize the second key associated with the content identification information, and generate, based on the recognized second key and the received terminal identification information, the third key including these pieces of information.
3. The content distribution server according to claim 2, wherein the key generating section confirms, upon generating the third key, whether a certain condition previously set by each content identification information is satisfied, and when satisfied, generates the third key.
4. The content distribution server according to claim 1, wherein the distribution-content storing section is stored with a plurality of distribution content files each provided with the different content data,
the regulatory program is configured such that the first key is differed depending on the content data, and is configured, upon performing a process for transmitting the terminal identification information to the content distribution server, to transmit distribution-file identification information for individually identifying the distribution content files, the distribution-file identification information being set by each distribution content file transmitted to the user terminal device, together with the terminal identification information,
the key storing section is stored with the distribution-file identification information and the second key which forms a pair with the first key in the regulatory program in the distribution content file specified by the distribution-file identification information in a manner to be associated with each other,
the key generating section, when receiving the terminal identification information and the distribution-file identification information transmitted from the user terminal device, refers to data stored in the key storing section based on the received distribution-file identification information, recognizes the second key associated with the distribution-file identification information, and generates, based on the recognized second key and the received terminal identification information, the third key including these pieces of information.
5. The content distribution server according to claim 4, wherein the key generating section confirms, upon generating the third key, whether a certain condition previously set by each distribution-file identification information is satisfied, and when satisfied, generates the third key.
6. The content distribution server according to any one of claims 1 to 5, wherein the distribution-content storing section is stored with a distribution content file provided with content data encrypted by the first key in the regulatory program, and
the regulatory program decodes, upon performing a process for reproducing the content data, the content data by the second key.
7. The content distribution server according to claim 6, wherein the regulatory program is configured, firstly, to perform a process for confirming whether an execution is a first time, and when the execution is the first time, the regulatory program further performs, in addition to each of the processes, a process for storing the generated terminal identification information into a storing section of the user terminal device, and when the execution is other than the first time, the regulatory program performs a process in which the terminal identification information is generated again, and whether the re-generated terminal identification information agrees with the terminal identification information stored in the storing section of the user terminal device is confirmed, and when agreement is determined, a process for reproducing the content data.
8. The content distribution server according to claim 7, further comprising:
a data storing section for storing the content data; and
a distribution-content generating section for generating the distribution content file by adding the regulatory program to the content data stored in the data storing section, generating the second key which forms a pair with the first key of the regulatory program, and storing the generated distribution content file into the distribution-content storing section and the generated second key into the key storing section.
9. A content distribution system configured such that a content distribution server and a user terminal device are connected via a telecommunication circuit, wherein
the content distribution server is formed of a content distribution server according to claim 8.
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 video display apparatus for displaying video images provided by a plurality of video input sections on a screen, comprising:
a screen display section that displays a plurality of video images as multiple screens in one screen, the plurality of video images being provided by the plurality of video input sections containing at least one image pickup section; and
a display video quality control section that, if the image pickup section to be controlled exists in the plurality of video input sections, increases update frequency of the screen for displaying the video image taken by the image pickup section to be controlled in the screen display section as compared with the update frequency of the screen for displaying a video image taken by any other video input section.
2. The video display apparatus according to claim 1 further comprising:
a control target determination section that determines whether or not the image pickup section to be controlled exists among the plurality of video input sections; and
a control time determination section that determines whether or not a predetermined time has elapsed since the image pickup section is placed out of the control target,
wherein when the predetermined time has elapsed, the display video quality control section restores the update frequency of the screen corresponding to the image pickup section placed out of the control target in the screen display section to the former update frequency.
3. The video display apparatus according to claim 1, wherein
the display video quality control section increases a distribution frame rate of the video data distributed from the image pickup section to be controlled and decreases the distribution frame rate of the video data distributed from any other video input section.
4. The video display apparatus according to claim 1,
wherein the display video quality control section increases a decode frame rate in decoding the video data coded by the image pickup section to be controlled and decreases the decode frame rate in decoding the video data coded by any other video input section.
5. The video display apparatus according to claim 1,
wherein the display video quality control section increases a drawing frame rate in drawing using the video data from the image pickup section to be controlled and decreases the drawing frame rate in drawing using the video data from any other video input section.
6. The video display apparatus according to claim 1,
wherein the display video quality control section increases an update frequency of the screen for displaying the video image taken by the image pickup section to be controlled and makes high an image quality of the video image distributed from the image pickup section to be controlled as compared with the image quality of the video image distributed from any other video input section.
7. The video display apparatus according to claim 1, wherein the display video quality control section changes the update frequency using at least two of the distribution frame rate of the video data distributed from the image pickup section to be controlled, the decode frame rate in decoding the video data and the drawing frame rate in drawing using the video data.
8. A video display apparatus for displaying a video image taken by an image pickup section on a screen, comprising:
a screen display section that displays the video image provided by the image pickup section;
a control target determination section that determines whether or not the image pickup section is to be controlled; and
a display video quality control section that, if the image pickup section is to be controlled, increases an update frequency of the screen for displaying the video image taken by the image pickup section in the screen display section as compared with the update frequency of the screen applied if the image pickup section is to be uncontrolled.
9. A video display method of displaying video images provided by a plurality of video input sections on a screen, the method comprising:
a screen display step of displaying a plurality of video images as multiple screens in one screen in a screen display section, the plurality of video images being provided by the plurality of video input sections containing at least one image pickup section;
a control target determination step of determining whether or not the image pickup section to be controlled exists among the plurality of video input sections, and
a display video quality control step of increasing, if the image pickup section to be controlled exists in the plurality of video input sections, the update frequency of the screen for displaying the video image taken by the image pickup section to be controlled in the screen display section as compared with the update frequency of the screen for displaying a video image from any other video input section.
10. An information processing apparatus being connected to a plurality of video input sections containing at least one image pickup section and displaying a video image on a display using the video data provided by the video input sections, the information processing apparatus comprising:
a screen display section that displays a plurality of video images as multiple screens in one screen on the display, the plurality of video images being provided by the plurality of video input sections containing the image pickup section;
a control target determination section that determines whether or not the image pickup section to be controlled exists among the plurality of video input sections; and
a display video quality control section that, if the image pickup section to be controlled exists in the plurality of video input sections, increases an update frequency of the screen for displaying the video image taken by the image pickup section to be controlled on the display as compared with the update frequency of the screen for displaying a video image from any other video input section.
11. A computer readable recording medium storing a program for causing a computer to function as the means of any of the video display apparatus according to claim 1.