Epson Projector Eb 825 User Manual

							A
Center of lens
B
* Distance from center of lens to suspension bracket fixing point
Units:  mm
Appearance
101 
						

							This  section  explains  easily  terms  that  are  used  with  the  projector  and  difficult  terms  that  are  not  explained  in  the  text  of  this  guide.  For  details,  refer
to  other  commercially  available  publications.
AMX Device Discovery
AMX Device Discovery is a technology developed by AMX to facilitate AMX control systems for easy operation of the target equipment.
Epson have implemented this protocol technology, and have provided a setting to enable the protocol function (ON).
See the 
AMX Web site for more details.
URL http://www.amx.com/
Aspect Ratio(Aspect Ratio)The ratio between an image's length and its height. HDTV images have an aspect ratio of 16:9 and appear elongated. The aspect ratio for
standard images is 4:3.Component V ideo
A Video signal which has the luminance component and color component separated to provide better image quality.
Refers to images that consist of three independent signals: Y (luminance signal), Pb and Pr (color difference signals).
Composite video
Video signals that have the video brightness signals and color signals mixed together. The type of signals commonly used by household video
equipment (NTSC, PAL, and SECAM formats). The carrier signal Y (luminance signal) and chroma (color) signal that are contained in the color
bar are overlapped to form a single signal.
Contrast
The relative brightness of the light and dark areas of an image can be increased or decreased to make text and graphics stand out more clearly, or
to make them appear softer. Adjusting this particular property of an image is called Contrast adjustment.
DHCP
An abbreviation of Dynamic Host Configuration Protocol, this protocol automatically assigns an 
IP Address
g to equipment connected to a
Network.
Dolby Digital
A sound format developed by Dolby Laboratories. Normal stereo is a 2-channel format that uses two speakers. Dolby Digital is a 6-channel
(5.1-channel) system which adds to this a center speaker, two rear speakers, and a sub-woofer.
Gateway address(Gateway Address)This is a server (router) for communicating across a Network (subnet) divided according to 
Subnet
 Mask
g.
HDTV
An abbreviation for High-Definition Television that refers to high-definition systems which satisfy the following conditions.
•Vertical resolution of 720p or 1080i or greater (p = 
Progressive
g, i = 
Interlace
g)
•Screen 
Aspect
 Ratio
g of 16:9
•
Dolby
 Digital
g audio reception and playback (or output)
Interlace
A method of image scanning whereby the image data is divided into fine horizontal lines that are displayed in sequence starting from left to right
and then from top to bottom. The even-numbered lines and odd-numbered lines are displayed alternately.
IP Address
A number to identify a computer connected to a Network.
Progressive
A method of image scanning whereby the image data from a single image is scanned sequentially from top to bottom to create a single image.
Glossary
102 
						

							Refresh Rate
The light-emitting element of a display maintains the same luminosity and color for an extremely short time. Because of this, the image must be
scanned many times per second to refresh the light-emitting element. The number of refresh operations per second is called the Refresh Rate
and is expressed in hertz (Hz).
SDTV
An abbreviation for Standard Definition Television that refers to standard television systems which do not satisfy the conditions for 
HDTV
g
High-Definition Television.
SNMP
An abbreviation for Simple Network Management Protocol, which is the protocol for monitoring and controlling devices such as routers and
computers connected to a TCP/IP Network.
sRGB
An international standard for color intervals that was formulated so that colors that are reproduced by video equipment can be handled easily by
computer operating systems (OS) and the Internet. If the connected source has an sRGB mode, set both the projector and the connected signal
source to sRGB.
SSID
SSID is an identification number for connecting with a counterpart on a Wireless LAN. Wireless communication is possible between devices
that correspond to SSID.
Subnet mask
(Subnet Mask)
This is a numerical value that defines the number of bits used for the Network address on a divided network (subnet) from the IP Address.
SVGA
A type of video signal with a resolution of 800 (horizontal) ^ 600 (vertical) dots that is used by IBM PC/AT-compatible computers.
S-Video
A Video signal which has the luminance component and color component separated to provide better image quality.
Refers to images that consist of two independent signals: Y (luminance signal) and C (color signal).
SXGA
A type of video signal with a resolution of 1,280 (horizontal) ^ 1,024 (vertical) dots that is used by IBM PC/AT-compatible computers.
Sync.
The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting images are
not of a good quality. The process of matching the phases of these signals (the relative position of the crests and the troughs in the signal) is
called Synchronization. If the signals are not synchronized, flickering, blurriness, and horizontal interference occur.
Tracking
The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting images are
not of a good quality. The process of matching the frequency of these signals (the number of crests in the signal) is called Tracking. If Tracking is
not carried out correctly, wide vertical stripes appear in the signal.
Trap IP Address
This is the 
IP Address
g for the destination computer used for error notification in SNMP.
VGA
A type of video signal with a resolution of 640 (horizontal) ^ 480 (vertical) dots that is used by IBM PC/AT-compatible computers.
WPS
WPS is an abbreviation of Wi-Fi Protected Setup. Wi-Fi Protected Setup has been devised by the Wi-Fi Alliance as a means of easily setting up
and securing a Wireless LAN.
XGA
A type of video signal with a resolution of 1,024 (horizontal) ^ 768 (vertical) dots that is used by IBM PC/AT-compatible computers.
Glossary
103 
						

							All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without the prior written permission of Seiko
Epson Corporation. No patent liability is assumed with respect to the use of the
information contained herein. Neither is any liability assumed for damages resulting
from the use of the information contained herein.
Neither Seiko Epson Corporation nor its affiliates shall be liable to the purchaser of
this product or third parties for damages, losses, costs, or expenses incurred by the
purchaser or third parties as a result of: accident, misuse, or abuse of this product or
unauthorized modifications, repairs, or alterations to this product, or (excluding the
U.S.) failure to strictly comply with Seiko Epson Corporation's operating and
maintenance instructions.
Seiko Epson Corporation shall not be liable against any damages or problems arising
from the use of any options or any consumable products other than those designated
as Original Epson Products or Epson Approved Products by Seiko Epson Corporation.
The contents of this guide may be changed or updated without further notice.
Illustrations in this guide and the actual projector may differ.
General  Notice:
Windows Vista and the Windows logo are trademarks of the Microsoft group of
companies.
IBM, DOS/V, and XGA are trademarks or registered trademarks of International
Business Machines Corporation.
Macintosh, Mac, and iMac are registered trademarks of Apple Inc.
Windows, WindowsNT, Windows Vista, and PowerPoint are trademarks or
registered trademarks of Microsoft Corporation in the United States.
Dolby is a trademark of Dolby Laboratories.
Pixelworks and DNX are trademarks of Pixelworks Inc.
WPA
™ and WPA2
™ are registered trademarks of Wi-Fi Allience.
PJLink trademark is a trademark applied for registration or is already registered in
Japan, the United States of America and other countries and areas.
Other product names used herein are also for identification purposes only and may
be trademarks of their respective owners. Epson disclaims any and all rights in those
marks.
Z
SEIKO  EPSON  CORPORATION  2009.  All  rights  reserved.
GNU GPL
This projector product includes the open source software programs which
apply the GNU General Public License Version 2 or later version ("GPL
Programs").
We provide the source code of the GPL Programs until five (5) years after the
discontinuation of same model of this projector product.
If you desire to receive the source code of the GPL Programs, please see the
"EPSON Projector Contact List" in the User's Guide, and contact the customer
support of your region.
These GPL Programs are WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
General Notes
104 
						

							The list of GPL Programs is as follows and the names of author are described in
the source code of the GPL Programs
The list of GPL Programs
busybox-1.7.2
libgcc1(gcc-4.2.3)
linux-2.6.20
patches
udhcp 0.9.8
uvc rev.219
wireless_tools 29
Pixelworks PWC950 SDK drivers
The GNU General Public License Version 2 is as follows. You also can see the GNU
General Public License Version 2 at  http://www.gnu.org/licenses/.
GNU GENERAL PUBLIC LICENSE Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth
Floor, Boston, MA 02110-1301 USA Everyone  is permitted to copy and distribute
verbatim copies of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your freedom to share and
change it. By contrast, the GNU General Public License is intended to guarantee
your freedom to share and change free software--to make sure the software is free for
all its users. This General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to using it.
(Some other Free Software Foundation so ftware is covered by the GNU Lesser
General Public License instead.) You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General
Public Licenses are designed to make sure  that you have the freedom to distribute
copies of free software (and charge for this service if you wish), that you receive
source code or can get it if you want it, that you can change the software or use
pieces of it in new free programs; and  that you know you can do these things.
To protect your rights, we need to make restrictions that forbid anyone to deny you
these rights or to ask you to surrender the rights. These restrictions translate to
certain responsibilities for you if you distribute copies of the software, or if you
modify it. For example, if you distribute copies of 
such a program, whether gratis or for a fee,
you must give the recipients all the right s that you have. You must make sure that
they, too, receive or can get the source  code. And you must show them these terms
so they know their rights.
We protect your rights with two steps: (1) copyright the software, and (2) offer you
this license which gives you legal permissi on to copy, distribute and/or modify the
software.
Also, for each author's protection and ours , we want to make certain that everyone
understands that there is no warranty for this free software. If the software is
modified by someone else and passed on, we  want its recipients to know that what
they have is not the original, so that any  problems introduced by others will not
reflect on the original authors' reputations.
Finally, any free program is threatened cons tantly by software patents. We wish to
avoid the danger that redistributors of a  free program will individually obtain patent
licenses, in effect making the program prop rietary. To prevent this, we have made it
clear that any patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copyin g, distribution and modification follow.
GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program  or other work which contains a notice
placed by the copyright holder saying  it may be distributed under the terms of
this General Public License. The "Program", below, refers to any such program
or work, and a "work based on the Pr ogram" means either the Program or any
derivative work under copyright law: that is to say, a work containing the
Program or a portion of it, either ve rbatim or with modifications and/or
translated into another language. (Hereinaf ter, translation is included without
limitation in the term "m odification".) Each licensee is addressed as "you".
Activities other than copying, distribu tion and modification are not covered by
this License; they are outside its scope.  The act of running the Program is not
restricted, and the output from the Pr ogram is covered only if its contents
constitute a work based on the Program  (independent of having been made by
running the Program). Whether that is  true depends on what the Program does.
General Notes
105 
						

							1. You may copy and distribute verbatim copies of the Program's source code as
you receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice and
disclaimer of warranty; keep intact all the notices that refer to this License and
to the absence of any warranty; and give any other recipients of the Program a
copy of this License along with the Program.
You may charge a fee for the physical act of transferring a copy, and you may at
your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion of it, thus
forming a work based on the Program, and copy and distribute such
modifications or work under the terms of Section 1 above, provided that you
also meet all of these conditions:
a) You must cause the modified files to carry prominent notices stating that
you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in whole or
in part contains or is derived from the Program or any part thereof, to be
licensed as a whole at no charge to all third parties under the terms of this
License.
c) If the modified program normally reads commands interactively when
run, you must cause it, when started running for such interactive use in the
most ordinary way, to print or display an announcement including an
appropriate copyright notice and a notice that there is no warranty (or
else, saying that you provide a warranty) and that users may redistribute
the program under these conditions, and telling the user how to view a
copy of this License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on the
Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If identifiable
sections of that work are not derived from the Program, and can be reasonably
considered independent and separate works in themselves, then this License,
and its terms, do not apply to those sections when you distribute them as
separate works. But when you distribute the same sections as part of a whole
which is a work based on the Program, the distribution of the whole must be on
the terms of this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest your rights to
work written entirely by you; rather, the intent is to exercise the right to control
the distribution of derivative or collective works based on the Program.In addition, mere aggregation of another work not based on the Program with
the Program (or with a work based on the Program) on a volume of a storage or
distribution medium does not bring the other work under the scope of this
License.
3. You may copy and distribute the Program (or a work based on it, under Section
2) in object code or executable form under the terms of Sections 1 and 2 above
provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable source
code, which must be distributed under the terms of Sections 1 and 2 above
on a medium customarily used for software interchange; or,
b) Accompany it with a written offer, valid for at least three years, to give any
third party, for a charge no more than your cost of physically performing
source distribution, a complete machine-readable copy of the
corresponding source code, to be distributed under the terms of Sections 1
and 2 above on a medium customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer to
distribute corresponding source code. (This alternative is allowed only for
noncommercial distribution and only if you received the program in
object code or executable form with such an offer, in accord with
Subsection b above.)
The source code for a work means the preferred form of the work for making
modifications to it. For an executable work, complete source code means all the
source code for all modules it contains, plus any associated interface definition
files, plus the scripts used to control compilation and installation of the
executable. However, as a special exception, the source code distributed need
not include anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component itself
accompanies the executable.
If distribution of executable or object code is made by offering access to copy
from a designated place, then offering equivalent access to copy the source code
from the same place counts as distribution of the source code, even though
third parties are not compelled to copy the source along with the object code.
General Notes
106 
						

							4. You may not copy, modify, sublicense, or distribute the Program except as
expressly provided under this License. Any attempt otherwise to copy, modify,
sublicense or distribute the Program is void, and will automatically terminate
your rights under this License. However, parties who have received copies, or
rights, from you under this License will not have their licenses terminated so
long as such parties remain in full compliance.
5. You are not required to accept this License, since you have not signed it.
However, nothing else grants you permission to modify or distribute the
Program or its derivative works. These actions are prohibited by law if you do
not accept this License. Therefore, by modifying or distributing the Program
(or any work based on the Program), you indicate your acceptance of this
License to do so, and all its terms and conditions for copying, distributing or
modifying the Program or works based on it.
6. Each time you redistribute the Program (or any work based on the Program),
the recipient automatically receives a license from the original licensor to copy,
distribute or modify the Program subject to these terms and conditions. You
may not impose any further restrictions on the recipients' exercise of the rights
granted herein. You are not responsible for enforcing compliance by third
parties to this License.
7. If, as a consequence of a court judgment or allegation of patent infringement or
for any other reason (not limited to patent issues), conditions are imposed on
you (whether by court order, agreement or otherwise) that contradict the
conditions of this License, they do not excuse you from the conditions of this
License. If you cannot distribute so as to satisfy simultaneously your obligations
under this License and any other pertinent obligations, then as a consequence
you may not distribute the Program at all. For example, if a patent license
would not permit royalty-free redistribution of the Program by all those who
receive copies directly or indirectly through you, then the only way you could
satisfy both it and this License would be to refrain entirely from distribution of
the Program.
If any portion of this section is held invalid or unenforceable under any
particular circumstance, the balance of the section is intended to apply and the
section as a whole is intended to apply in other circumstances.It is not the purpose of this section to induce you to infringe any patents or
other property right claims or to contest validity of any such claims; this section
has the sole purpose of protecting the integrity of the free software distribution
system, which is implemented by public license practices. Many people have
made generous contributions to the wide range of software distributed through
that system in reliance on consistent application of that system; it is up to the
author/donor to decide if he or she is willing to distribute software through any
other system and a licensee cannot impose that choice.
This section is intended to make thoroughly clear what is believed to be a
consequence of the rest of this License.
8. If the distribution and/or use of the Program is restricted in certain countries
either by patents or by copyrighted interfaces, the original copyright holder
who places the Program under this License may add an explicit geographical
distribution limitation excluding those countries, so that distribution is
permitted only in or among countries not thus excluded. In such case, this
License incorporates the limitation as if written in the body of this License.
9. The Free Software Foundation may publish revised and/or new versions of the
General Public License from time to time. Such new versions will be similar in
spirit to the present version, but may differ in detail to address new problems or
concerns.
Each version is given a distinguishing version number. If the Program specifies
a version number of this License which applies to it and "any later version", you
have the option of following the terms and conditions either of that version or
of any later version published by the Free Software Foundation. If the Program
does not specify a version number of this License, you may choose any version
ever published by the Free Software Foundation.
10. If you wish to incorporate parts of the Program into other free programs whose
distribution conditions are different, write to the author to ask for permission.
For software which is copyrighted by the Free Software Foundation, write to
the Free Software Foundation; we sometimes make exceptions for this. Our
decision will be guided by the two goals of preserving the free status of all
derivatives of our free software and of promoting the sharing and reuse of
software generally.
General Notes
107 
						

							NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS
NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING
THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE
PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED
TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER
PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM
AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN
IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to
the public, the best way to achieve this is to make it free software which everyone can
redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them to
the start of each source file to most effectively convey the exclusion of warranty; and
each file should have at least the "copyright" line and a pointer to where the full
notice is found.

Copyright (C)  This program is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA 02110-1301 USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this when it starts in
an interactive mode:
Gnomovision version 69, Copyright (C) year name of author Gnomovision
comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is
free software, and you are welcome to redistribute it under certain conditions;
type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may be called
something other than `show w' and `show c'; they could even be mouse-clicks or
menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your school, if
any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample;
alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may consider it
more useful to permit linking proprietary applications with the library. If this is what
you want to do, use the GNU Lesser General Public License instead of this License.
General Notes
108 
						

							GNU LGPL
This projector product includes the  open source software programs which
apply the GNU Lesser General Public License Version 2 or later version ("LGPL
Programs").
We provide the source code of the LGPL Programs until five (5) years after the
discontinuation of same model of this projector product.
If you desire to receive the source code of the LGPL Programs, please see the
"EPSON Projector Contact List" in the  User's Guide, and contact the customer
support of your region.
These LGPL Programs are WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
The list of LGPL Programs is as follows  and the names of author are described
in the source code of the LGPL Programs.
LGPL Programs
uClibc-0.9.29
SDL-1.2.13
The GNU Lesser General Public License Version 2 is as follows. You also can see the
GNU Lesser General Public License Version 2 at  http://www.gnu.org/licenses/.
GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc. 51 Franklin Street, Fifth
Floor, Boston, MA 02110-1301 USA Everyone  is permitted to copy and distribute
verbatim copies of this license document, but changing it is not allowed.
[This is the first released version of the Le sser GPL. It also counts as the successor of
the GNU Library Public License, version 2, hence the version number 2.1.]
Preamble
The licenses for most software are designed to take away your freedom to share and
change it. By contrast, the GNU General Public Licenses are intended to guarantee
your freedom to share and change free software--to make sure the software is free for
all its users. This license, the Lesser General Public Lice
nse, applies to some specially designated
software packages--typically libraries--of the Free Software Foundation and other
authors who decide to use it. You can use  it too, but we suggest you first think
carefully about whether this license or th e ordinary General Public License is the
better strategy to use in any particular case, based on the explanations below.
When we speak of free software, we are referring to freedom of use, not price. Our
General Public Licenses are designed to make sure that you have the freedom to
distribute copies of free software (and char ge for this service if you wish); that you
receive source code or can get it if you want it; that you can change the software and
use pieces of it in new free programs; an d that you are informed that you can do
these things.
To protect your rights, we need to make re strictions that forbid distributors to deny
you these rights or to ask you to surrender these rights. These restrictions translate to
certain responsibilities for you if you distri bute copies of the library or if you modify
it.
For example, if you distribute copies of th e library, whether gratis or for a fee, you
must give the recipients all the rights that we gave you. You must make sure that
they, too, receive or can get the source code . If you link other code with the library,
you must provide complete object files to the recipients, so that they can relink them
with the library after making changes to  the library and recompiling it. And you
must show them these terms  so they know their rights.
We protect your rights with a two-step me thod: (1) we copyright the library, and (2)
we offer you this license, which gives you  legal permission to copy, distribute and/or
modify the library.
To protect each distributor, we want to ma ke it very clear that there is no warranty
for the free library. Also, if the library is  modified by someone else and passed on, the
recipients should know that what they have  is not the original version, so that the
original author's reputation will not be  affected by problems that might be
introduced by others.
Finally, software patents pose a constant th reat to the existence of any free program.
We wish to make sure that a company canno t effectively restrict the users of a free
program by obtaining a restrictive license fr om a patent holder. Therefore, we insist
that any patent license obtained for a vers ion of the library must be consistent with
the full freedom of use specified in this license.
General Notes
109 
						

							Most GNU software, including some libraries, is covered by the ordinary GNU
General Public License. This license, the GNU Lesser General Public License, applies
to certain designated libraries, and is quite different from the ordinary General
Public License. We use this license for certain libraries in order to permit linking
those libraries into non-free programs.
When a program is linked with a library, whether statically or using a shared library,
the combination of the two is legally speaking a combined work, a derivative of the
original library. The ordinary General Public License therefore permits such linking
only if the entire combination fits its criteria of freedom. The Lesser General Public
License permits more lax criteria for linking other code with the library.
We call this license the "Lesser" General Public License because it does Less to
protect the user's freedom than the ordinary General Public License. It also provides
other free software developers Less of an advantage over competing non-free
programs. These disadvantages are the reason we use the ordinary General Public
License for many libraries. However, the Lesser license provides advantages in
certain special circumstances.
For example, on rare occasions, there may be a special need to encourage the widest
possible use of a certain library, so that it becomes a de-facto standard. To achieve
this, non-free programs must be allowed to use the library. A more frequent case is
that a free library does the same job as widely used non-free libraries. In this case,
there is little to gain by limiting the free library 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 number of people to use a large body of free software. For example,
permission to use the GNU C Library in non-free programs enables many more
people to use the whole GNU operating system, as well as its variant, the GNU/Linux
operating system.
Although the Lesser General Public License is Less protective of the users' freedom, it
does ensure that the user of a program that is linked with the Library has the
freedom and the wherewithal to run that program using a modified version of the
Library.
The precise terms and conditions for copying, distribution and modification follow.
Pay close attention to the difference between a "work based on the library" and a
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