[Clipart] looking for "denco" and tracking artists' contributions

[Jeremy C. Reed]

Does anyone have contact information for "denco"?

Or can someone provide or point me to replacements for this bad licensed 
clipart?

clipart/computer/hardware/8port_switch_denco.svg:        <cc:license rdf:resource="http://creativecommons.org/licenses/GPL/2.0/"/>
clipart/computer/hardware/8port_switch_denco.txt:License:  http://creativecommons.org/licenses/GPL/2.0/
clipart/computer/hardware/firewall_denco_01.svg:        <cc:license rdf:resource="http://creativecommons.org/licenses/GPL/2.0/"/>
clipart/computer/hardware/firewall_denco_01.txt:License:  http://creativecommons.org/licenses/GPL/2.0/
clipart/computer/8port_switch_denco.svg:        <cc:license rdf:resource="http://creativecommons.org/licenses/GPL/2.0/"/>
clipart/computer/8port_switch_denco.txt:License:  http://creativecommons.org/licenses/GPL/2.0/
clipart/computer/firewall_denco_01.svg:        <cc:license rdf:resource="http://creativecommons.org/licenses/GPL/2.0/"/>
clipart/computer/firewall_denco_01.txt:License:  http://creativecommons.org/licenses/GPL/2.0/

I used one in a printed book because I trusted the "openclipart.org" 
project.

Since the website repeatedly mentions public domain, I am hoping this was 
just an accident and the clipart is public domain.

Also, does openclipart.org consider to only allow submissions that have 
been reviewed AND also have a valid contact information?

Thanks

  Jeremy C. Reed

p.s. This is in regards to bug 7303
https://bugs.freedesktop.org/show_bug.cgi?id=7303