[1arity]

Yeah, but hard copies on what? Discs, paper, what's the medium with the 10K year time horizon ?

Wait, I got it. Stone Tablets. Just have to get a Google project off the ground to inscribe all the worlds code in slate.

[imauld]

Considering all the bits and pieces of plastic we have manufactured will be around on this planet until well after we are gone I would take a guess at saying plastic film would be best.

[onedev]

We can call it Project Alphabet.