[King-Aaron]

It's a big difference, especially in a legal sense, and if that attacker is a government player.

Walking in a back door which you have a key for, if argued correctly in a court, is a lot different than breaking in through a window.

[c_c_c]

No. If your job is to secure systems there is zero difference. If other than primary has key, it's not secure. If you can break in, it's not secure. Legal arguments are irrelevant.

[mannykannot]

I am not convinced that the legal difference will carry much weight with all the potential exploiters, but if it does, there is always the question of how you acquired the key.