This analogy is severly flawed, to the point of being essentially irrelvant. There are no locks involved here, in any way. Let's work with this row of doors a

This analogy is severly flawed, to the point of being essentially irrelvant. There are no locks involved here, in any way. Let's work with this row of doors analogy. The owner has invited the world to the building this hallway resides in, and has posted a list somewhere that told you about a few of the doors in this hallway. You notice there are other doors too, inbetween the doors you were told about and you enter them. That's really a far more accurate analogy. Locks require an active attempt to prevent access. Not finding the exact url as link elsewhere is extremely far from an active attempt. There's really no reason to believe the owner has any less intention for you to see it than say, the home page, which you probably accessed through a third party or by typing the url directly.