To poorly translate Victor Hugo : "The principle is twofold, let us not forget it. The book, as a book, belongs to the author, but as thought, it belongs - the word is not too vast - to the human race. All intelligences are entitled to it. If one of the two rights, the right of the writer and the right of the human mind, should be sacrificed, it would certainly be the right of the writer, for the public interest is our sole preoccupation, and All, I declare, must pass before us."
If you didn't know anything about Blizzard, what would you speculate? Someone elsewhere in the thread for example is speculating Blizzard would destroy the copy -- if I thought that'd be a possibility, I would personally never send it their way and you could in no world convince me it's moral to send a piece of history to its demise.
As for morality, I apply the golden rule: if someone found the code I wrote for a groundbreaking piece of software, and I didn't want to open source it, I'd really like for them to respect my wishes and return it.
Edit: I'm unable to reply further, but to clarify I was referring to the maxim of reciprocity or "do unto others". If the positions were reversed I'd want my property returned. If I find someone's wallet I'd return it if possible, as I'd want someone to return mine.
"The needs of the many outweigh the needs of the few" is my favorite Star Trek quote, but I don't think it applies in this situation as it was intended as a motivation for a personal decision to sacrifice, not to force someone else to sacrifice. That line of thought can get pretty dark pretty fast.
Is that really the golden rule? What about "the good of the many"?
Returning it to Blizzard directly is good for Blizzard. Returning your code is good for you. Realistically, it has little monetary value (all the "value" will be spent on lawyers arguing what the value is), so maybe it's only good for you because it's simpler for you.
What if your sense of morality is not in line with everyone else's sense, and I'm returning code to someone who will not do "the moral thing" afterwards? Does that make me immoral?
Point is, this is not an easy decision at all. It's not an easy answer at all. I'd be petrified and I believe anyone else who spends time to consider the implications would be too.
That's like saying that robbing Bill Gates and distributing the money to millions of poor people is morally good because it's good for many people.
To expand on this, it's good in general to return leaked code of active-development projects because that helps the social contract of turning work into something that can be sold. So if I found jakebasile's 2015 code in an alley, it would be in some sense good for everyone for me to return it.
But that doesn't apply to a 20 year old master for starcraft. There is no promotion of the useful arts in returning the CD in this specific case, and it's a hugely relevant cultural artifact.
If some distributed the source code, what would happen? It's not like people could start releasing new StarCraft games to compete with Blizzard. And it seems unlikely that the source code is going to give someone some kind of an advantage it creating other competing games against Blizzard.
Obviously legally it's Blizzard's right to keep the code private, and there are times where it's advantageous to do so, but this doesn't really seem like one of those times.
The golden rule is, like most other unilateral rules, an oversimplification. Of course, that's what makes it attractive — it's an effortless substitute for having to think through the complex and messy realities of any given situation. But let's not kid ourselves that something is automatically good because we would want that thing in Blizzard's situation, case closed.
so does "do unto others", if you follow it.
additionally you just argued that the same moral rules and rights that apply to you, a living breathing individual with an inner drive to enact right over wrong, can be transferred to an entire corporation, a legal construct blind to ethics unless forced by legal rules. which is kinda inhumane.
and, the golden rule is only a good moral yardstick if your choices in what you'd want to have others do unto you are moral in the first place. not a very nice thing to question, sorry, but your hypothetical example does feature you writing groundbreaking software but wanting to keep it closed source. depending on the software and how groundbreaking it is, that's an open question, very much up to discussion.
What if you said that after the copyright had expired? Would you still say it's immoral to release it against your wishes?
If you believe in private property rights, then sure. If not, then no. Some such as Max Stirner, 19th century philosopher, would disagree with your assertion that it is a moral issue.
Now everyone's free to be the gremlin sitting on the sack, but if that sack literally is a masterpiece that shaped the whole of civilization, one day people will gently hoist you aside and replace the sack beneath you with a sack of similar monetary value, to put your original sack in museum.
Sorry if that's inconceivable in a black and white worldview. And no - its not communism, that is civilization. A right to destroy art does not exist.
No moral or ethical issue whatsoever. Nobody's rights violated. Everybody wins.