Source:
http://store.steampowered.com/app/570/Dota_2/

Edit history can be found by entering this post’s link here:
https://phist.steemdata.com/

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If you are unsure about what's legal, this link has great information: https://www.checkforplagiarism.net/plagiarism-law.
Although US focused, the rules around copyright and the damage that can be done to your reputation are very similar in most countries. It is additionally scorned in the Steem sea and is a flaggable offense.