I admire Monokai color scheme. Did the makers of Sublime Text design it or is it in use before Sublime Text arrived?
The second part of the question is that can I freely copy it for my own editor or does anybody have copyright on it?
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According to the oldest post about it I could find, Monokai was developed by Wimer Hazenberg in 2006 for Textmate. It has since been distributed among all sorts of other text editors.
You can freely copy it for your own editor as there is no real way* to copyright a color scheme. To be absolutely sure you could email him, the address is on the site.