A couple decades ago I used Wayback Machine to win a DMCA takedown case that almost bankrupted me.<p>An American military contractor (I'm Canadian) stole a large chunk of content from my site, search/replaced my company name for theirs. They even made really slick PDF files complete with graphics (that were possibly actually theirs) to make it look legit. When confronted, their legal dept claimed I actually stole it from them. I was <i>FUMING</i>!<p>The worst thing was that when confronting their lead techie, I asked him to describe a particular bit of terminology that is very specific to me and my business. He claimed he couldn't because it was proprietary. Of course it was because he simply didn't know anything about that particular term. I guess he thought that would drag things out long enough that I'd eventually drop it. I didn't.<p>I then demonstrated that this bit of terminology is attributed to <i>me</i> in a published IEEE document that also predated the content appearing on his web page. But for whatever reason, their web page and all their marketing collateral said that <i>they</i> created it all.<p>Needless to say, they ended up removing the content and paying damages. I couldn't afford to take it further, and given their significant wealth, would have easily quashed me if I tried. I won and got paid for it, so I accepted it was probably the most I could possibly get.<p>I got the idea based on the "poor man's copyright," which is when musicians, for example, postal mail lyrics to themselves and then store the unopened envelope in a safe in order to prove, via postmark, that the copyright date is legit.<p>I suspect github could also be used this way. Anything that keeps a strongly maintained timeline.