Spectra Watermakers 956YH60001 manual

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Table of contents for the manual

  • Page 1

    Sp e ctr a Bl ueSc ale V ision Ca m e r a U s e r G u i d e[...]

  • Page 2

    ii P/N: 956YH60001 Copyright © 2007. All Rights Reserved. Docume nt Version: 1. 0 All trademarks and trade names are the properties of their respective owners.[...]

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    Table of Contents CHAPTER 1 INTR ODU CTION .............................................................................................. 1 Overview ...................................................................................................................... ....... 1 Physical Details - Netw ork Camera .....................................[...]

  • Page 4

    ii CHAPTER 6 WINDOWS MONITO R/P LAYBACK/IP RECO RDE R UTILITY ............ 53 Overview ...................................................................................................................... ..... 53 Installation .................................................................................................................. ...... [...]

  • Page 5

    1 Chapter 1 Introduction This Chapter provides details of the Network Camera's features, compo nents and capabilities. Overview The Network Camera has an Integrated Microcomputer and a high quality CMOS digital-Image-Sensor, enablin g it to display high quality live streaming video over your wired LAN, the Intern et, and for the Network Camera[...]

  • Page 6

    • Viewing/Recording Utility. A user-friendly Windows utility is provided for viewing live video. For periods when you are absent, or f or scheduled rec ording, this a pplication als o allows you to record video to a n ASF file on y our PC. The rec orded fi les are in a standard Windows Media form at, and thus usable by a wide variety of programs [...]

  • Page 7

    Physical Details - Network Camera Front - Network Camera Lens No physical adjustment is required or possible for the len s, but you sh ould ensure that th e len s cover remain clean. The image quality is de graded if the lens c over is dirty or smudge d. Microphone The built-in microphone is mounted on the front. Power LED (Green) On - Power o n. O[...]

  • Page 8

    4 Package Contents The followin g items should be included: If a ny of these item s are damaged or m issing, please contact your dealer immedi ately. 1. Network C amera 2. Antenna (Wireless Model Only) 3. Power adapter 4. Installation CD-ROM 5. Quick Installation Guid e[...]

  • Page 9

    2 Chapter 2 Basic Setup This Chapter provides details of installin g and configuring th e Netwo rk Camera. System Requirements • To use the wi red LAN interfa ce, a standard 10/100BaseT hub or switch and network cabl e is required. • To use the Wir eless interface, ot her Wireless de vices must be co m pliant with the IEEE802.11b or IE EE80 2.1[...]

  • Page 10

    4. Check the LEDs • The Power LED will turn on briefly, then start blinking. It will blink dur ing startup, which takes 15 to 20 seconds. After startup is completed, the Power LED shoul d remain ON. • The Network LED shoul d be ON. For more infor mation, refer to Physical Details - Network Camera in Chapter 1. Setup using the Windows Wizard Ini[...]

  • Page 11

    2. The next screen, shown below, will list all the Network Cameras on your LAN. Figure 3: Camera List Screen • Select the desired Camera from the list on the left. The current settings for the selected Ca mera will be displayed in the tabl e on the right. • Click Next to continu e . 3. You will be prompted to enter the Admin istrato r Name and [...]

  • Page 12

    4. This screen allows you to enter a suitable Description , and set th e correct Time Zone , Date , and Time . Make any desi red changes, then click Next to continue. Figure 5: Camera Settings 5. On the following IP Address Settings screen, shown below, choose Fixed IP Address or Dynamic IP Address . Figure 6: Fixed or Dynamic IP Selection • Fixe[...]

  • Page 13

    6. If you chose Fixed IP Address , the following TCP/IP Settings screen will be displayed. Figure 7: TCP/ IP Settings • Enter an unused IP Address from within the address range use d on your L AN. • The Subnet Mask and Default Gateway fi elds must m atch the values used by PCs on your LAN. • The Primary DN S a ddress is required in order to u[...]

  • Page 14

    10 8. Click OK to confirm that you want to save the new settings. If you want to cancel your changes, click Cancel . Figure 9: Confirm Screen 9. After clicking OK , you will see the screen below. Figure 10: Final Screen Clicking t he Install Utility button will install th e Viewing/Recording utility d escribed in Chapter 6 - Windows V iewing/Record[...]

  • Page 15

    3 Chapter 3 Viewing Live Video This Chapter provides basic informa tion about viewing live vid eo. Overview After finishin g setu p vi a the Win do ws -ba sed Wizard, all LAN users can view li ve vide o using Internet Ex pl ore r on Windows. This Chapter has details of viewing live video using Internet Explorer. But many other powerful feat ures an[...]

  • Page 16

    4. When you connect, the following screen will be d isp layed. Figure 11: Home Screen 5. Click View Video . 6. If the Adm inistrator has restricted access to known users, y o u will then be prompted for a username and password. Enter the nam e and password assi gned to you by t he Network Cam era administrator. 7. The first time you connect to the [...]

  • Page 17

    Connecting to a Camera via the Internet You can NOT connect to a camera v ia the Inte rne t unless the camera Administrator has configur ed both the camera and the Internet Gate w ay/Router used by the camer a. See Making Video available from the Internet in Chapter 4 - Advanced Viewing Setup for details of the required configuration. Also, you nee[...]

  • Page 18

    6. If the Adm inistrator has restricted access to known users, y o u will then be prompted for a username and password. Enter the nam e and password assi gned to you by t he Network Cam era administrator. 7. The first time you connect to the camera, you will be prompted to install an ActiveX component (OCX or CAB file), as in the example below. You[...]

  • Page 19

    15 General Options These options are always available, re gardless of the type of camera you are c onnected to. Camera Patrol. Move through the Preset pos itions in the sequence defined by the Camera Adm inistrator. Camera Auto Pan. Click this to have the camera moved fro m left to right automatically. Motion Detection. Click this button to have th[...]

  • Page 20

    4 Chapter 4 Advanced Viewing Setup This Chapter provides informatio n about the optiona l settings and features for viewing video via the Network Camera. This Chapter is for the C amera Administrator only. Introduction This chapter describes some addition a l settin gs and options for viewing live Video: • Adjusting the video image • Controllin[...]

  • Page 21

    3. Make the re quired adjustm ents, as explained below, and save your changes. MPEG-4 Settings Resolution Select the de sired video resolution fo rmat. The defaul t resolution is set to 320*240. Video Quality Control • Constant Bit Rate: Select the d e sired b it rate. The default is set to 1.2 Mbps. • Fixed Quality: Select the desired op tion [...]

  • Page 22

    Controlling User Access to the Video Stream By default, anyone can connect to the Network Camera and view live Video at any time. If desired, you can limit access to sc heduled time s, and als o restrict access to known users. To Control User Access to Live Video: 1. Connect to the Web-based interf ace of the Network Camera. (See Chapter 5 - Web-ba[...]

  • Page 23

    Making Video available from the Internet If your LAN i s connected to the Internet, typical ly by a Broadband Gateway/Router a nd Broadband m odem, you can make the Network Camera available via th e Internet. You will need to configure your Router or Gatew a y to allow connections from the Inte rnet to the camera. Router/Gateway Setup Your Router o[...]

  • Page 24

    Network Camera Setup The Network Cam era confi g urati o n d oes N OT ha ve be c h ange d, unless: • You wish to change the port n umber from the de fault value (1024). • You wish to us e the DDNS (Dynamic DNS ) feature of the Netwo rk Camera. HTTP Port Configuration Normally, HTTP (Web) connections use por t 80. Since the Network Camer a uses [...]

  • Page 25

    2. Enter and save th e correct DDNS settings on th e DDNS screen of the Network Cam e ra. Figure 20: DDNS Screen 3. Operation is then automatic: • The Network Camera will automatically contact the DDNS serv er whenever it detects that the Intern et IP address has changed, and i nform the DDNS server of the new IP a ddress. • Internet users can [...]

  • Page 26

    Viewing Live Video with the Viewing/Recording Utility If using the Windows Viewing/Recording Utility, the details of the Network Camera must be entered on the Camera Setu p screen. Figure 21: Add Camera from Internet See Chapter 6 - Windows Monitor/Playback/IP Record er Utility for full details on using the Windows Viewing/Record ing utility. 22[...]

  • Page 27

    Motion Detection Alerts The Motion Detection feature can generate an Alert when motion is detected. The Network Camera will compare consecutive frames to det ect changes caused by the movement of large objects. But the motion detector can also be triggered by: • Sudden cha nges in the level of available li ght • Movement of the camera itself. T[...]

  • Page 28

    24 5. Select the E-Mail screen to have alert s sent by E-m ail: • Enable and enter at least one (1) E-m ail address • Select or enter the desired options for Video Attachment , Show " From" as and Subject fields. • Enter details of the SMTP Server used to send the E-mail. If the Motion Detection feature is enabled, but E-Mail is not[...]

  • Page 29

    5 Chapter 5 Web-based Management This Chapter provides Setup details of th e Network Camera ’s Web-based Interface. This Chapter is for the Camera Administrator only. Introduction The Network Camera can be configured usin g you r Web Browser. The Network Camera must have an IP address which is compatible with your PC. The recomm ended method to e[...]

  • Page 30

    Welcome Screen When you connect, the following screen will be displayed. Figure 23: Welcome Screen The menu options available from this screen are: • View Video - View live Vi de o using your Web Browser. See Chapter 3 - V iewing Live Video for details. • Administration - Access the Adm inistration menu. 26[...]

  • Page 31

    Administration Menu Clicking o n Administration on the menu provides access to all th e settings for the Network Camera. The Administration menu contains t he following opt ions: Setup • System • Network • Wireless (Wireless Model Only) • DDNS Video & Audio • Video & Audio • Video Access • User Database • Pan/Tilt Event • [...]

  • Page 32

    System Screen After clicking Administration on the main menu, or selecting System on the Administration menu, you will see a screen like the example below. Figure 24: System Screen Data - System Screen System Settings Device ID This displays the name for th e Network Camera. Camera Name Enter the desired nam e for the Network Cam era. Description T[...]

  • Page 33

    Time Zone Choose the Time Zone for your location fro m the drop-down list. If your location is currently using Daylight Saving , en able the Adjust for daylight saving ch eckbox. You must UNCHECK this checkbox when Daylig ht Saving finishes . Network Time Protocol Enable or di sable the Tim e Server feature a s required. If Enabled, the Network Cam[...]

  • Page 34

    Data - Network Screen Net w ork Obtain an IP Address Automatically If selected, the Network Camera will obtain its IP a ddress and related information from a DHCP Server. Only select this option if your LAN has a DHCP Server. Use the following IP Address If selected, you must assign t he following data to the Net work Camera. • IP Address - Enter[...]

  • Page 35

    Wireless Screen (Wireless Model Only) This screen is displayed when the Wireless menu option is clicked. Figure 26: Wireless Screen Data - Wireless Screen Wireless Network WSC PIN Code It displays the WSC PIN co de number for the camera. Network Type This determines the type of wireless communication used by the Network Camera. • If you have an A[...]

  • Page 36

    Security Security System Select the desir ed option, and then enter the set tings for the sel ected method: • Disabled - No security is used. Anyone using the correct S SID can conne ct to your networ k. • WEP - The 802.11b standard . Data is en crypted before transmission, but the en cryptio n system is not very strong. • WPA/WPA2 Personal -[...]

  • Page 37

    DDNS Screen Many Internet connections use a "Dy namic IP address", where the Internet IP address is allocated wh e never the Internet connecti on is established. This means that other Internet users don't know th e IP address, so can't establish a connection . DDNS is designed to solve this problem, as follows: • You must regi[...]

  • Page 38

    Data - DDNS Screen DDNS Enable DDNS Enable or di sable the DDNS function, as requi red. Only enable this feature if y ou have registered for the DDNS Service with a DDNS Server provid er. Service Provider Choose a service provider from the list. Web Site Button Click this button to open a new window and connect to the Web site for the selected DDNS[...]

  • Page 39

    Video & Audio Screen This screen is displayed when the Video & Audio option is clicked. Figure 28: Video & Audio Screen 35[...]

  • Page 40

    Data - Video & Audion Screen MPEG-4 Settings Resolution Select the de sired video resolution fo rmat. The defaul t resolution is set to 320*240. Video Quality Control • Constant Bit Rate: Select the d e sired b it rate. The default is set to 1.2 Mbps. • Fixed Quality: Select the desired op tion . The default fix quality is set to Normal. Ma[...]

  • Page 41

    Video Access Screen This screen is displayed when the Video Access option on the Video & Audio menu i s clicked. Figure 29: Video Access Screen 37[...]

  • Page 42

    Data - Video Access Screen User Acc ess Enable Security Checking • If disabled - No login re quired, users do not have to provi de a username and pa ssword when they connect to the camera to view vide o. • If enabled - Require login, users will be prompted for a username and password when they connect to the camera to view video. T he camera ad[...]

  • Page 43

    User Database Screen This screen is displayed when the User D atabase op tion on the Video & Audio menu is cl icked. Figure 30: User Database Screen Data - User Database Screen Existing Users User List This displays all users you have entered into the User database. If you have not enter ed an y users, this list will be empty. Edit, Delete, Del[...]

  • Page 44

    Pan/Tilt Screen This screen is displayed when the Pan/Tilt option on th e Video & Audi o menu is cli cked. Figure 31: Pan/Tilt Screen Data - Pan/Tilt Screen Pan/Tilt Enable Pan/Tilt Control Enable the check box in order to use the Pan/Tilt fun ction. Preset Point Position Click this button to define the preset point positio n. Set Patrol Sequen[...]

  • Page 45

    Set Preset Position Screen This screen is displayed when the Preset Poin t Positions button on the Pan/Tilt screen is clicked . Figure 32: Preset Point Position Screen Data - Preset Point Positions Calibration Click this button to reset the calibratio n of Pan/Tilt area. Preset List Select the desired Preset. The screen will update with th e curren[...]

  • Page 46

    Motion Detection Screen This screen is displayed when the Mo tion Detection op tion on the Event menu is cl icked. . Figure 33: Motion Detection Screen Data - Motion Detection Screen Motion Detection Set Detection Areas You can set the full screen or areas of the video image to be exam ined. Note: Mot ion detection can be triggered by rapid cha nge[...]

  • Page 47

    E-Mail Screen This screen is displayed when the E-Mail optio n on the Event menu is clicked. . Figure 34: E-Mail Screen Data - E-Mail Screen Primary/Secondary SMTP Server SMTP Server Address Enter the addre ss of the SMTP (Si mple Mail Trans port Protocol) Se rver to be use d to send E-Mai l. Authentication Select the desired Authentication type fo[...]

  • Page 48

    FTP Screen This screen is displayed when the FTP optio n on the Event menu is clicked. Figure 35: FTP Screen Data - FTP Screen Primary/Secondary FTP FTP Server Enter th e address of the F TP Serv er. Port Enter the Port of the FTP Server to be connected. Login name Enter y our login nam e for the FTP Server . Password Enter your password for the FT[...]

  • Page 49

    HTTP Screen This screen is displayed when the HTTP option on the Eve nt menu is clicked. Figure 36: HTTP Screen Data - HTTP Screen HTTP Notification Enable En ab le this checkbox to use the HTTP Notification . URL Enter the URL of your HTTP no tification server. Proxy Server Name Specify t he proxy server name in the provi ded field if t he camera [...]

  • Page 50

    Event Trigger Screen This screen is displayed when the Event Trigger option on the Event menu i s clicked. Figure 37: Event Trigger Sc reen Data - Event Trigger Screen Event Sched u l e Schedule List The Event Schedu le shows all of the ev en t types curren tly configu r ed in the Network Camera, along with various information abou t th eir configu[...]

  • Page 51

    Trigger Event Motion Detection If enabled, movement in a motio n d etection window can be used to trigg er even ts. Pan/Tilt Configuration This option is only availab le if your cam era is fitted with a Pan/Tilt control. If available, select the desired option to resolve conflict between the Pan/Tilt and Motion Detection features. Interval Select t[...]

  • Page 52

    Maintenance Screen . Figure 38: Maintenance Screen Data - Maintenance Screen Administrator Login Administrator ID Enter the name for the Adm i nistrator here . Spaces, punctuation, and s pecial characters must NOT be used in the name. Administrator Password The password for the Administrator. Verify Password Re-enter the passwor d for the Admi nist[...]

  • Page 53

    Backup & Restor e Backup Configuration File Click Backup button to save the current config uratio n information to a text file. Restore Configuration File Click Restore button to reinitialize the ca mera to load the new updated software. Do this after loading the upgrade file. Clear File Name This does NOT stop the Restore process if it has sta[...]

  • Page 54

    Status Screen . Figure 39: Status Screen Data - Status Screen System Device Name This s hows the nam e of the Netwo rk Camera. Description This shows the descriptio n of the Netwo rk Camera, such a s location. F/W version The versi o n of t he curre nt fir mware installed. Net w ork MAC Address The current IP address of the Network Camera. IP Addre[...]

  • Page 55

    Wireless (Wireless Model Only ) WSC PIN Dode It displays the current WSC PIN code. Network Type This shows the Network Type currently in use (Ad-hoc or Infr astru cture). SSID This d isplays the wireless SSID. Channel This shows th e wireless ch annel currently used. Security The curren t secu rity setting for Wireless conn ections. Signal Stren gt[...]

  • Page 56

    52 Log Screen This screen displays a log of system activity. . Figure 40: Log Screen Data - Log Screen Log System Log This is a log of system activity. Enable Syslog Service Check th e box to en able the System Log Server feature. Syslog Server Address Enter the address of the Syslog Serv er. Refresh Button Click this to update the data shown on sc[...]

  • Page 57

    6 Chapter 6 Windows Monitor/Playback/IP Recorder Utility This Chapter d escribes how to view an d record the live video st ream generate d by the Network Ca mera, using the supplied Windows utility. Overview The recommended m ethod to view video is to use the supplied Wi ndows Viewing/Recording utility. Th is utility also allows you to record the v[...]

  • Page 58

    System Tray Icon When started, the program will create an icon in the Wi ndows system tray on the taskbar, as sh own below. Figure 42: System Tray Icon You can right click the icon and it will prov ides a menu which allows you to v iew program details, v iew the main screen, or ter mina te the program. Main Screen When started, a screen like the ex[...]

  • Page 59

    Camera Setup To define a camera and ass ociate it with a Channel Number . 1. Click the Setup button on the main screen. You will see a screen like th e example below. Figure 44: Camera Setup Screen 2. Select the desired C hannel number in the left ( No. ) column. 3. There are 2 radio button s, for LAN or Internet . The de fault is LAN . See t he fo[...]

  • Page 60

    Camera Data - LAN Local ID This is the name you gave t o this camera. This field must be entered. Camera Name This is the default name for the Ne twork Camera, and cannot be changed. IP Address The current IP address of the Network Camera. Port Number This will normally display "80". Only chan ge this if requested to do so by the Network [...]

  • Page 61

    Adding Cameras on the Internet If the Network Camera you wish to ad d is no t on your LAN, but is available v ia the Internet, click th e Internet button. You will see a screen like the example below. Figure 45: Add Camera from Internet To associate a camera with t he current Channel : 1. Enter the Camera Data on the panel on the right. See below f[...]

  • Page 62

    Stream Type Select the desir ed video stream type. There mi ght be either MPEG 4 or Motion-JP G streami ng type. Setup Camera Pages Click this button to connect the Web-based interface of the Camera Enable Trigger Event Check this if you want th e Camera to have the feature enabled. You can add the same Camera t w ice, once for the LAN, and again f[...]

  • Page 63

    Move Control . Use this to move the camera to the desired position. There may a short delay after clicking the desired icon. You sh ould wait a couple of seconds rather than click again. Channel Indicator. This indicates the c urrent channel (camera). Play. Use this to re-start viewing, after using the Stop or Pause button. Pause. Use this to tempo[...]

  • Page 64

    Recording Video You can rec ord Video while watching, or sched ule recordings to occur when you are a bsent. Recordin gs are stored in a stan dard Microsoft ASF file format , and can be played using Microsoft M edia Player. Before doing a ny recording, you s hould review the reco rding settings to ensure they are suitable for your PC. Recording Sch[...]

  • Page 65

    Preferences This screen is displayed after clicking the Preferences tab on the Set up screen. If necessary, change these settings to suit your environm ent. Figure 47: Preferences Screen Data - Preferences Recordin g Paths Recording This is the Drive and Folder on your PC where record ed files will be placed. You ne ed a drive which has large amoun[...]

  • Page 66

    Disk Allocation for Each Camer a Re c ording Total Disk Space This displays the total size of the disk selected for storing recordings. Available Disk Space This displays the available space of the disk selected for storing rec ordings. Enable Disk space limitation Enable this if you wish to limi t the disk space u sed by video recordings. Maximum [...]

  • Page 67

    63 Using Playback To access the saved files of the Cam era, click Playback button in the Main screen, then you will see the following screen. Figure 48: Playback Screen Searching Recorded Video Files Select Camera. Select the desired cam era from the list. Recording Meth ods. Select the type of the recorded file from the drop-down list that you wis[...]

  • Page 68

    7 Chapter 7 Troubleshooting This chapter covers the most likely problems and their solutions. Overview This chapte r covers some common problem s that may be enco untered whi le using the Net work Camera and s ome possibl e solutions to them. If you follow the suggested steps and th e Network Camera still does n ot function prop erly, contact your [...]

  • Page 69

    65 Problem 4 I can't connect to the Network Ca mer a us ing a Wireless connecti on. Solution 4 1) If a LAN cable is c onnected to the LAN port, the Wireless interface is disabled. Only one interface ca n be active. 2) Check that your PC and the Network Camera have compatible Wireless settings. • Mode (Infrast ructure or Ad-h oc) must be corr[...]

  • Page 70

    A Appendix A Specifications Network Camera Model Network Camera Dimensi ons 90mm ( W) * 35mm (H) * 90mm (D) Operating Temperature 0 ° C to 40 ° C Storage Temperature 0 ° C to 40 ° C Network Prot o c ol s TCP/IP, DHCP, SMTP, NT P, HTTP, FTP, RTP, RTSP, UPnP (Discovery/Traversal) Network Interface 1 Ethernet 10/100BaseT (RJ45) LAN connection Wire[...]

  • Page 71

    Regulatory Approvals FCC Statement This equipm ent generates, use s and can radia te radio freque ncy energy and, if not installed and u sed in accordance wi th the instructions, may cause harmful interference to radio commun ication s . However, there is no guaran tee that interference will no t occur in a particular installation. If this equipm e[...]

  • Page 72

    Copyright Notice Many softwa re components a re covered by t he GNU GPL (Gene ral Public License ). Some are covere d by other Li censes as listed i n the table below. Details of each applicable license are contained in the following section. No Warranty THIS SOFT WARE IS PROVIDED B Y THE AUTHOR A ND CONTRIBUTORS ' ' AS IS'' AND[...]

  • Page 73

    thttpd.c - tiny/turbo/throttling HTTP server Copyright ? 1995,199 8,1999,2000,2 001 by Jef Posk an zer < jef@mail.acm e.com > All rights reserved. Redistribution and use in source and binary fo rms, with or with out modification, are permitted prov ided that the following co nd itions are met: 1. Redistrib utions of source code must retain th[...]

  • Page 74

    Libupnp-1.2.1 License Copyright (c) 20 0 0 Int e l Cor poration. All ri ght s reserved. Redistribution and use in source and binary fo rms, with or with out modification, are permitted prov ided that the following co nd itions are met: 1. Redistrib utions of source code must retain the above c opyri ght notice, this list of conditions and the follo[...]

  • Page 75

    GNU General Public License GNU GENERAL PUBL IC LICENSE Version 2, June 1991 Copyright (C ) 19 8 9, 1991 Free Software F o u ndat i o n, Inc. 51 Franklin St, Fifth Floor, Boston , MA 02110-1301 USA Everyone is permitte d to copy and dist ribute verbatim copies of this license document, but changing it is not allo wed . Preamble The licenses for most[...]

  • Page 76

    You may charge a fee for t he physical act of trans ferring a copy, and you ma y at your opti on offer warranty protection in e xcha nge for a fee. 2. You may modify your copy o r copies of the Program or any por tio n of it, thus forming a work ba sed on the Program, and cop y a nd distribute s uch modificati ons or work unde r the terms of Se cti[...]

  • Page 77

    restrictions on the recipients' exercise of the righ ts grante d herein .You are no t re sponsible for enforcing co mpliance b y third parties to this License. 7. If, as a c onsequence of a c ourt judgm ent or allegati on of patent i nfringement or for any othe r reason (not limited to pat ent issues), conditions are i mposed on you (wheth er [...]

  • Page 78

    Lesser GNU General Public License GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999 Copyright (C ) 19 9 1, 1999 Free Software F o u ndat i o n, Inc. 51 Franklin St, Fifth Floor, Boston , MA 02110-1301 USA Everyone is permitte d to copy and dist ribute verbatim copies of this license document, but changing it is not allo wed . [This is th[...]

  • Page 79

    free library does the same job as widely used non-free libraries. In this case, there is little to gain by limitin g the free l ibrary to free software only, so we use the Lesser General Public License. In other cases, permission to use a particular library in non- free programs enables a greater num ber of people to use a large b ody of free softw[...]

  • Page 80

    (For exam ple, a function in a library to compute square roots has a purpose that is e ntirely well-defi ned independe nt of the ap plication. Therefore, S ubsection 2d requ ires that any applicat ion-supplied f unction or table use d by this funct ion must be opti onal: if th e application does no t su pply it, the square root function must still [...]

  • Page 81

    who changes the conten ts of definitions files in the Library will not necessarily be able to recompile the application to use t he modifi ed definitions. ) b) Use a suitable shared library mechanism for linking with the Li brary. A suitable mechan ism is one that (1) uses at run time a copy of the library already present on the us er's comput[...]

  • Page 82

    78 in reliance on consisten t app lication of that system; it is up to the author/donor to d ecide if he or she is willing to d istrib ute software through any ot her system and a li censee cannot impose that choice. This section is intended to m ake thoroughly cl ear what is believed t o be a conseque nce of the rest of this License. 12. If the di[...]

  • Page 83

    B Appendix B Streaming Video/Audio Solution Overview Streaming vi deo is a sequence of "moving images" t hat are sent in c ompressed form over the Internet a nd displayed by the viewer as they arrive. Wi th streaming, a Web user does n ot have to wa it to download a large file bef ore seeing the vi deo or hearin g the s ound. Instead, the[...]