You mention "algorithm"... algorithms can't be copyrighted, and although it can be argued that they shouldn't even be patentable (as mathematical equations aren't), in the 1990s courts in the US effectively allowed algorithms to be patented "when part of an implementation". Also in some other countries algorithms were always patentable.
But that's patents, we're talking about copyright here. You absolutely can't copyright an algorithm. And "not looking" doesn't protect you from a patent anyway, so go ahead and look at the code unless you want to write a functional clone and claim that it's in no way a derivative work.
But that's patents, we're talking about copyright here. You absolutely can't copyright an algorithm. And "not looking" doesn't protect you from a patent anyway, so go ahead and look at the code unless you want to write a functional clone and claim that it's in no way a derivative work.