if there's no readme, then redistribution isn't allowed. similarly, it must state explicitly in  readme that redistribution is allowed, otherwise it's a copyright violation.  analogous to going into a store - even tho there isn't sign on everything saying theft is forbidden, it's still illegal.

hence 3d-cc prevented wayback machine from crawling their site, perhaps because they no longer wanted their items redistributed.

however, I don't object if youse want to share.  as legume used to say: "do as thou wilt shall be the whole of the law".