User manual

XCSoar User Manual
(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 interac-
tively 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 copy-
right notice and a notice that there is no warranty (or else,
saying that you provide a warranty) and that users may re-
distribute 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 Pro-
gram, 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 li-
censees 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 con-
test 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.
4. 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
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