"Read only" icon from <a href="tango.freedesktop.org/Tango_Desktop_Project"> Tango Project </a> <br><br> Since version 0.8.90 Tango Project icons are Public Domain: <a href="tango.freedesktop.org/Frequently_Asked_Questions#Terms_of_Use.3F"> Tango Project FAQ </a>
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tango emblem readonly free icon was designed by warszawianka for icons Png and presented to its users.
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2/7/2018