Question: creation date of the "gnuplot license"

Hi activists of gnuplot,

I'm a Wikidata volunteer and I'm trying to plot software licenses on a
timeline. Weird example:
https://w.wiki/5fr4

The only info that I'm missing is:
When was the "gnuplot license" first invented / published?

Do you know the date?

Then:

Can you be so kind to write this information somewhere on your website,
in order to link that as source?

Thank you so much for your help!

-boz

-- 
[[User:Valerio Bozzolan]]


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Have fun with software freedom!



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