User's Manual

121
versionsoftheGeneralPublicLicensefromtimetotime.Such
newversionswillbesimilarinspirittothepresentversion,but
maydierindetailtoaddressnewproblemsorconcerns.
 Eachversionisgivenadistinguishingversionnumber.Ifthe
Programspecies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dierent,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.