open source license that only allows the code to be shared through blurry phone photos of white on black text editor windows on really dim, smudged screens
it has to be one photo per screen page of text btw you can't do any stitching, also ocr is strictly forbidden

The roguelike ADOM had a revival fundraiser where pricey perks included receiving printed out individual pages of the source code. The game has always been closed source so that its inner workings would be much harder to figure out. For $50K you could get the entire source code in physical form and have to sign an NDA.



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