How completely block the keyboard (temporarily)?

[Wesley :}]

Good evening,
I am making an application that needs to temporarily block (to make an
electronic transfer of funds), the laws here in Brazil say that this type of
software the keyboard should be blocked or disabled for the user throughout
the transfer of funds, I can do this using any function or modification of
X.org? How?
Thanks to all

-- 
Wesley Henrique Godoy.
:: Linux User #446682 ::
Computer Science
Federal University of Viçosa
Brazil
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