The programming and sound creation was done by Juergen Grund, using the freeware software of 'SlidePiano', Version 5, by Thomas Erne and 'Audacity', Version 1.2.6.
The design of the calendar (background image) was created by Juergen Grund. The yellow moon, Santa Claus and the reindeers were taken from 'The Big Box of Art' by Hemera Technologies Inc.
The images behind the doors were taken from 'The Big Box of Art', Version 3.5, by Hemera Technologies Inc.
According to GEMA, the played Christmas songs are licence-free.
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