Remember Rox Desktop? http://en.wikipedia.org/wiki/ROX_Desktop Very similar to how mac os works. Lay down a base system with the common libraries in a central location. Apps are just custom folders with a very specific directory structure. It's not horrible, as an end user it's kind of nice. It will lead to security whack-a-mole issues when common but non-core libs have issues, but nothing's perfect.

You're kind of conflating two issues. It isn't so much about security (so password protection doesn't apply). Nor is it about robots.txt (vivid wants to be found).

The issue is that what vivid would like to have happen is that if an 18+ year old person were to google for 'return to booby island' he would find links to or images from vivid entertainment.

If someone underage were to search for the same thing, google should magically know and display more appropriate images.

The current industry standard comes up a little short WRT robots.txt since it's a binary statement and what they're really after is conditional qualifiers. Essentially they're looking for a way to express situations when that content is valid to display or not.

Now, all of this comes with a big grain of salt. The actual article and opinions expressed are... not very reasonable or well thought out IMO.