Like I said: why let some body in w/o hiding important things from sight first? I have been known to use a big car cover...it's OK to let on that you're doing things which must be kept secret.So if the point is pushed, out comes a ND and NC and what ever else a solicitor could dream up for the visitor to sign, and see it they get a bit less pushy.
Funny thing is, that at one point I would have been willing to hog-tie my soul in such a fashion. Glad it never came up, that's certain.
cheers,
Douglas