Dear Rizaldy Rapsing,
Dia is free software and therefore you're most welcome to review it,
take screenshots from
it and write about it!
I guess you're aware already that all the legal fine print related to
Dia is in the GPL
(the license that covers Dia):
http://www.gnu.org/licenses/gpl-2.0.html
Please let us know once the book is out so that we can promote it.
Regards,
Steffen
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