Essentially the Ninth circuit is trying to proactively eliminate the plain view exception to warrant requirements under the fourth amendment when applied to computer searches.
I can't do the decision justice or put it in context. I recommend reading the following posts if you're interested in learning more. Some excellent discussion topics on the first blog post below.
- How the Ninth Circuit Tried To End Plain View for Computer Searches Without Ending Plain View for Computer Searches.
- Beyond A-Rod and ManRam: Plain Talk on the ‘Plain View Doctrine
Personally, I think this is a pretty good idea, we'll just have to see whether it passes muster constitutionally.