Clipart contributed by Bootlin
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Location
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https://bootlin.com/pub/clipart/

License
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Public Domain

Usage
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These images are available freely for any use.
They can be copied, modified, distributed without
any restriction.

It is advised to use the SVG (Scalable Vector Graphics)
sources of these clipart files.

They can be used or edited by several drawing programs,
in particular the excellent Inkscape Open Source program
(http://inkscape.org), available under multiple platforms
(GNU/Linux, MacOS X, Windows).

These images have been contributed
to the Open Clip Art project (http://openclipart.org),
which collects a huge number of public domain clipart
images.