[escapecharacter]

We could make a license plate big enough that aliens could see it and know we are sophisticated.

[prerok]

Nah, let's just put a big sign "Kilroy was here", so they don't bother with the "mostly harmless" planet.

[kazinator]

If four out of seven digits were blurred out, then they would really see how sophisticated we are: we have the concept of privacy!