Addressbook online

I'd like to have a way to have updated contact information of peopl I know. This could be done by putting a file on a webserver, containing this address information. This file should be updated when you move, etc. Your friends and bussiness associates could then, using a PIM program like Evolution, import this file, or actually the link.

One problem would be that everyone can find your address info, and I'm not comfortable with that. But it wouldn't be a problem for my friends to have this info.

This means that it should be possible to restrict access to parts of the file. In practice this could mean that you create a second file, containing not all information, like only name and e-mail address. The first file should then be protected, but how can that be done.