$(Q)cp "$(ROOT_DIR)/os/dos/cwsdpmi/cwsdpmi.txt"   "$(BUNDLE_DIR)/docs/"

	$(Q)cp "$(ROOT_DIR)/os/dos/cwsdpmi/cwsdpmi.exe"   "$(TTD_DIR)/"

CWSDPMI is Copyright (C) 1995-2000  Charles W Sandmann (sandmann@clio.rice.edu)

                                    1206 Braelinn, Sugar Land, TX 77479

This is release 5.  The files in this binary distribution may be redistributed

under the GPL (with source) or without the source code provided:

* CWSDPMI.EXE or CWSDPR0.EXE are not modified in any way except via CWSPARAM.

* CWSDSTUB.EXE internal contents are not modified in any way except via

  CWSPARAM or STUBEDIT.  It may have a COFF image plus data appended to it.

* Notice to users that they have the right to receive the source code and/or

  binary updates for CWSDPMI.  Distributors should indicate a site for the

  source in their documentation.

-------------------------------------------------------------------------------

CWSDPMI was written to provide DPMI services for V2 of DJGPP.  It currently

does not support 16-bit DPMI applications, or DPMI applications requiring a

built in extender.  It does support virtual memory and hardware interrupt

reflection from real mode to protected mode.  DJGPP V1.1x and RSX applications

will also run using this server, which can be used to provide enhanced control

over hardware interrupts.  Some DPMI 1.0 extensions (0x506, 0x507, 0x508) have

been implemented.

CWSDPR0.EXE is an alternate version which runs at ring 0 with virtual memory

disabled.  It may be used if access to ring-0 features are desired.  It

currently does not switch stacks on HW interrupts, so some DJGPP features

such as SIGINT and SIGFPE are not supported and will generate a double fault

or stack fault error (to be fixed someday).

CWSDSTUB.EXE is a stub loader image for DJGPP which includes CWSDPMI.  This

allows single executable image distributions.  You can use the EXE2COFF

program and COPY /B CWSDSTUB.EXE+yourimage yourimage.exe to create a

standalone executable image.

Some of the internal tuning and configuration parameters may be modified

in the image using CWSPARAM.EXE (see CWSPARAM.DOC).

If you want to use CWSDPMI with DJGPP, you expand the distribution into the

DJGPP directory tree.  CWSDPMI.EXE will be put in the BIN directory with your

DJGPP images and it will automatically be loaded when they run.

Directions for use (server can be used in either of two different ways):

1) "cwsdpmi" alone with no parameters will terminate and stay resident

   FOR A SINGLE DPMI PROCESS.  This means it unloads itself when your

   DPMI application exits.  This mode is useful in software which needs

   DPMI services, since CWSDPMI can be exec'ed and then will unload on exit.

2) "cwsdpmi -p" will terminate and stay resident until you remove it.

   It can be loaded into UMBs with LH.  "cwsdpmi -u" will unload the TSR.

3) The file used for virtual memory swapping, if desired, is controlled

   by the "-sc:\cwsdpmi.swp" syntax on the command line.  You must specify

   either a file with full disk/directory syntax, or "-s-" which disables

   virtual memory.

4) The default swap file name is c:\cwsdpmi.swp, but this can be changed

   with the CWSPARAM image, as can some other parameters.

5) You can disable the DPMI 1.0 extensions by starting the image with the

   "cwsdpmi -x" syntax.  This feature allows you to run programs developed

   under other DPMI providers which do not behave properly with these

   extensions enabled (typically use of NULL pointers).

I would like to give special thanks to DJ Delorie who wrote the original

GO32 code on which CWSDPMI is based.  Morten Welinder also provided and

improved much of the code in this program.

-------------------------------------------------------------------------------

This section contains a list of the error messages you might see out of

CWSDPMI and some details on what they mean.

Exceptions are only handled by CWSDPMI if the application does not establish

an exception handler, exceptions nest 5 deep, or the error is particularly bad:

"Page fault" -

  1) an illegal page fault happens in a RMCB or HW interrupt, (lock all pages!)

  2) all available pages have been locked,

  3) the application is using non-committed pages for null pointer protection.

"Double Fault" - multiple exceptions occurred

"Invalid TSS" - typically due to RMCB or HW interrupt being called after the

   selectors/memory have been deallocated (remember to reset the mouse)

"General Protection Fault" - bad parameter sent to a DPMI call

"80386 required."

Since 80286 and lesser processors don't have the hardware necessary to

run CWSDPMI.  No workaround, upgrade.

"DOS 3 required."

A few interrupts are used which need DOS 3.0 or higher.  I don't expect to

ever see this message, since 80386 machines were introduced after DOS 3.0

and that check is made first.

"CWSDPMI V0.90+ (r5) Copyright (C) 2000 CW Sandmann  ABSOLUTELY NO WARRANTY"

An informational message displayed if the program is not run in one-pass mode.

"Protected mode not accessible."

This message should only be displayed if running CWSDPMI in a protected

environment with no access to protected mode.  In this case, DPMI should

already be available and CWSDPMI would not be needed.  This might happen if

a 16-bit DPMI client is loaded and a DJGPP image attempts to load CWSDPMI

to provide 32-bit DPMI services under Windows.

"Warning: cannot open swap file c:\cwsdpmi.swp"

Maybe you are out of file handles, or the swap file name is incorrectly

specified in the image (change the name with cwsparam).

"No swap space!"

This message means you tried to use more paging file than CWSDPMI was

configured to handle.  Since this is protected against in the memory

allocation code, you should never see this message.

"Swap disk full!"

This means the paging file could not be expanded when trying to page

memory out to disk.  This would normally not be seen, unless you are

writing output to the same disk which holds the paging file.  Decrease

the amount of memory your DPMI application is using or free up disk space.

"Interrupt 0x??"

Your application tried to call an interrupt from protected mode which

normally shouldn't be called (something like a data pointer).  If the

request was allowed to continue it would likely hang your machine.  If you

see this message and think the interrupt should be allowed to continue, let

me know.

"Error: Using XMS switched CPU into V86 mode."

This message might be seen if you have your memory manager in AUTO mode.  The

only workaround in this case is to stop using AUTO mode.

"Error: could not allocate page table memory"

The page table memory (a minimum of 16Kb) is allocated from conventional

memory (either in the 640Kb region or UMBs).  If CWSDPMI cannot allocate the

minimum necessary memory, you would see this message.  Free up some

conventional memory.  You may also see this message if a page directory needs

to be faulted in, and there are no available pages.  This means too many pages

have been locked for the allocated page tables available.  While CWSDPMI

tries to dynamically allocate these if needed, this effort failed.  You need

to increase the number of page tables with CWSPARAM, or increase the amount

of free conventional memory if it is low.  If the application which calls

CWSDPMI internally manages all the DOS memory, the page tables may need to

be pre-allocated at DPMI startup time (if this is needed, try using the

run option flag 2 in cwsparam).

"16-bit DPMI unsupported."

CWSDPMI is a 32-bit only DPMI server.  Ideally, on the request to enter DPMI's

PM with a 16-bit request, we would just fail the call setting the carry bit

like the DPMI specification describes.  Some buggy 16-bit compiler tools don't

check the return status and will hang the machine in this case.  So, I issue

an error message and exit the image instead.

"Descriptors exhausted."

An attempt to nest a DPMI client failed in the setup phase due to insufficient

free selectors in the LDT.

"CWSDPMI not removed"

When the -u parameter is specified, if DPMI is not detected this message is

printed.  Informational.

		    GNU GENERAL PUBLIC LICENSE

		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.

                          675 Mass Ave, Cambridge, MA 02139, 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 software is covered by

the GNU Library 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 rights 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 permission 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 constantly 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 proprietary.  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 copying, 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 Program"

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 verbatim or with modifications and/or translated into another

language.  (Hereinafter, translation is included without limitation in

the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution 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 Program

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.

  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.

  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.

			    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

	Appendix: 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.

    <one line to give the program's name and a brief idea of what it does.>

    Copyright (C) 19yy  <name of author>

    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., 675 Mass Ave, Cambridge, MA 02139, 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) 19yy 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.

  <signature of Ty Coon>, 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 Library General

Public License instead of this License.

This is the file "copying.dj".  It does NOT apply to any sources or

binaries copyrighted by UCB Berkeley, the Free Software Foundation, or

any other agency besides DJ Delorie and others who have agreed to

allow their sources to be distributed under these terms.

   Copyright Information for sources and executables that are marked

   Copyright (C) DJ Delorie

                 7 Kim Lane

                 Rochester NH  03867-2954

This document is Copyright (C) DJ Delorie and may be distributed

verbatim, but changing it is not allowed.

Source code copyright DJ Delorie is distributed under the terms of the

GNU General Public Licence, with the following exceptions:

* Sources used to build crt0.o, gcrt0.o, libc.a, libdbg.a, and

  libemu.a are distributed under the terms of the GNU Library General

  Public License, rather than the GNU GPL.

* Any existing copyright or authorship information in any given source

  file must remain intact.  If you modify a source file, a notice to that

  effect must be added to the authorship information in the source file.

* Runtime binaries, as provided by DJ in DJGPP, may be distributed

  without sources ONLY if the recipient is given sufficient information

  to obtain a copy of djgpp themselves.  This primarily applies to

  go32-v2.exe, emu387.dxe, and stubedit.exe.

* Runtime objects and libraries, as provided by DJ in DJGPP, when

  linked into an application, may be distributed without sources ONLY

  if the recipient is given sufficient information to obtain a copy of

  djgpp themselves.  This primarily applies to crt0.o and libc.a.

-----

Changes to source code copyright BSD, FSF, or others, by DJ Delorie

fall under the terms of the original copyright.  Such files usually

have multiple copyright notices in them.

A copy of the files "COPYING" and "COPYING.LIB" are included with this

document.  If you did not receive a copy of these files, you may

obtain one from whence this document was obtained, or by writing:

      Free Software Foundation

      59 Temple Place - Suite 330

      Boston, MA 02111-1307

      USA

		  GNU LIBRARY GENERAL PUBLIC LICENSE

		       Version 2, June 1991

 Copyright (C) 1991 Free Software Foundation, Inc.

                    675 Mass Ave, Cambridge, MA 02139, 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 library GPL.  It is

 numbered 2 because it goes with version 2 of the ordinary GPL.]

			    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 Library General Public License, applies to some

specially designated Free Software Foundation software, and to any

other libraries whose authors decide to use it.  You can use it for

your libraries, 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 library, or if you modify it.

  For example, if you distribute copies of the 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 a program 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.

  Our method of protecting your rights has two steps: (1) copyright

the library, and (2) offer you this license which gives you legal

permission to copy, distribute and/or modify the library.

  Also, for each distributor's protection, we want to make certain

that everyone understands that there is no warranty for this free

library.  If the library is modified by someone else and passed on, we

want its recipients to know that what they have is not the original

version, so that any problems introduced by others will not reflect on

the original authors' reputations.

  Finally, any free program is threatened constantly by software

patents.  We wish to avoid the danger that companies distributing free

software will individually obtain patent licenses, thus in effect

transforming the program into proprietary software.  To prevent this,

we have made it clear that any patent must be licensed for everyone's

free use or not licensed at all.

  Most GNU software, including some libraries, is covered by the ordinary

GNU General Public License, which was designed for utility programs.  This

license, the GNU Library General Public License, applies to certain

designated libraries.  This license is quite different from the ordinary

one; be sure to read it in full, and don't assume that anything in it is

the same as in the ordinary license.

  The reason we have a separate public license for some libraries is that

they blur the distinction we usually make between modifying or adding to a

program and simply using it.  Linking a program with a library, without

changing the library, is in some sense simply using the library, and is

analogous to running a utility program or application program.  However, in

a textual and legal sense, the linked executable is a combined work, a

derivative of the original library, and the ordinary General Public License

treats it as such.

  Because of this blurred distinction, using the ordinary General

Public License for libraries did not effectively promote software

sharing, because most developers did not use the libraries.  We

concluded that weaker conditions might promote sharing better.

  However, unrestricted linking of non-free programs would deprive the

users of those programs of all benefit from the free status of the

libraries themselves.  This Library General Public License is intended to

permit developers of non-free programs to use free libraries, while

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