[doctorosdeck]

Yea you can just try to guess the passphrase, but if you want to make it harder you can always use a passphrase + the last 4 digits of their phone number under options. The difference between the passphrase and the custom url key is that at least for me a passphrase is alot easier to pass along. Just telling someone the password is 'house' and them having to put in their phone number is easier to pass along to a non-technical person then a custom url.