Access that does not require authentication should never be a crime. If LinkedIn wants the courts to intervene, they must require authentication for their data. If they also want Google to scrape their site, they must require Googlebot to authenticate itself.
> Access that does not require authentication should never be a crime. Careful, this could legitimize things like accidental denial of service. Depending on circumstances, even basic scraping could cause problems. (I need to be vague to avoid violating an NDA.) A major internet site had a URL that went something like somedomain/group?id=xxxxx. It turns out that a simple scraper, that called id=1, id=2, id=3, ect, ect…
This is a failure on the part of the developers at that "major internet site". Using a guid instead of consecutive IDs, a rate limiter, hell even just a cache...or all of the above. There are lots of solutions here.
You have to take robot scraping and indexing into consideration, and assume people will ignore robots.txt. (Certain bots, i.e. msnbot/bingbot are quite aggressive!)