Table of Contents
Advertisement
>
Z
C7
X
3.
4.
5.
You may opt to apply the terms of the ordinary
GNU General
Public License instead of this License to a given copy of the
Library. To do this, you must alter all the notices that refer to
this License, so that they refer to the ordinary
GNU General
Public License, version 2, instead of to this License. (Ifa newer
version than version
2 of the ordinary
GNU General Public
License has appeared,
then you
can specify
that version
instead if you wish.) Do not make any other change in these
notices.
Once this change is made in a given copy, it is irreversible for
that copy, so the ordinary GNU General Public License applies
to all subsequent
copies and derivative works made from that
copy.
This option is useful when you wish to copy part of the code
of the library into a program that is not a library.
You may copy and distribute
the library (or a portion or deriv-
ative of it, under Section 2) in object code or executable form
under the terms of Sections 1 and 2 above provided that you
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.
If distribution
of 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 satisfies the
requirement
to distribute
the source code, even though
third
parties are not compelled to copy the source along with the
object code.
A program that contains
no derivative
of any portion
of the
Library, but is designed
to work with the Library
by being
compiled
or linked with
it, is called a "work that uses the
Library". Such a work, in isolation,
is not a derivative
work of
the Library, and therefore
falls outside
the scope of this
license.
However, linking a "work that uses the library" with the Library
creates an executable
that
is a derivative
of the
Library
(because
it contains
portions
of the library),
rather than a
"work that uses the library". The executable is therefore
cov-
ered by this license. Section 6 states terms for distribution
of
such executable.
When a "work that uses the library" uses material from a head-
er file that is part of the library, the object code for the work
may be a derivative work of the library even though the source
code is not.
Whether this is true is especially significant if the work can be
linked without
the library, or if the work is itself a library. The
threshold for this to be true is not precisely defined by law.
If such an object file uses only numerical
parameters,
data
structure
layouts and accessories, and small macros and small
inline functions
(ten lines or less in length),
then the use of
the object file is unrestricted,
regardless of whether it is legal-
ly a derivative work. (Executable
containing
this object code
plus portions
of the library will still fall under Section 6.)
Otherwise,
if the work is a derivative
of the library, you may
distribute
the object code for the work under the terms of
Section 6. Any executable containing
that work also fall under
Section
6, whether
or not they are linked directly
with the
library itself.
6.
As an exception to the sections above, you may also combine
or link a "work that uses the library" with the library to pro-
duce a work containing
portions
of the library, and distribute
that work under terms of your choice, provided that the terms
permit
modification
of the work for the customer's
own use
and reverse engineering
for debugging
such modifications.
You must give prominent
notice with each copy of the work
that the library is used in it and that the Library and its use
are covered by this license. You must supply a copy of this
license.
If the
work
during
execution
displays
copyright
notices, you must include the copyright
notice for the library
among them, as well as a reference directing
the user to the
copy of this license. Also, you must do one of these things:
a) Accompany
the work with the complete
corresponding
machine-readable
source
code for the library
including
whatever changes were used in the work (which must be
distributed
under Sections 1 and 2 above); and, if the work
is an executable
linked with the Library, with the complete
machine-readable
"work that uses the Library", as object
code and/or
source code, so that the user can modify the
library and then relink to produce
a modified
executable
containing
the modified
library.
(It is understood
that the
user who changes the contents
of definitions
files in the
library will not necessarily be able to recompile the appli-
cation to use the modified definitions.)
b) Use a suitable shared library mechanism for linking with the
library. A suitable mechanism is one that (1) uses at run time
a copy of the library already present on the user's computer
system, rather than copying library functions
into the exe-
cutable, and (2) will operate properly with a modified version
of the library, if the user installs one, as long as the modified
version
is interface-compatible
with the version that the
work was made with.
c) Accompany
the work with a written
offer, valid for at least
three years, to give the same user the materials specified
in
Subsection
6, above, fora charge no more than the cost of
performing
this distribution.
d) If distribution
of the work is made by offering
access to
copy from a designated
place, offer equivalent
access to
copy the above specified
materials from the same place.
e) Verify that the user has already received a copy of these
materials or that you have already sent this user a copy.
106
Advertisement
Table of Contents
