In fact that *is* legally considered an invitation! Back about
15 years ago the fact that many systems (UNIX, for example, and I think VMS too) had such invitations by default became apparent, and it scared more "non-aware" managers half to death than you can shake a stick at! The "Please Login" messages got changed to absolutely hilarious (ever see the warning at the bottom of any email that every attorney ever sends, they were commonly twice as verbose) warning about prohibited access being punishable by law, and citing specific statutes etc etc. Followed by "Login:", absent the "Please"!Let me clip out, and add some emphasis to what you *said*:
Yeah... just ask Randal Schwartz, who went to jail because he and HP had a very different opinion of what constitutes implied permission.