Django Smart Selects - What does 'models world readable' mean??

I need to chain some select boxes in my admin forms to make data input less error-prone and easier. There are quite a few projects like django-smart-selects out there, but django-smart-selects seems to be quite easy to implement. However, I don't understand the implications of the warning for django-smart-selects - 

Warning: The AJAX endpoint enforces no permissions by default. This means that any model with a chained field will be world readable.

I searched the django documentation for some insights, and did not come up with anything. 

Could someone explain in more detail the issue with a world readable model? In what situations would it be irrelevant and in what situations would it be a huge security risk?

Thanks!

Mark

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