Form validation using model data?

I have a model for Websites that has 3 fields: name, url and authenticated. With a form both the name and url can be changed, but when the website is authenticated i don't want to allow that the url changes.

I'm thinking about making the url (form) field readonly but in html the field becomes still an input field (just with readonly="True"), so i have doubts whether hackers will be able to post a changed value anyhow (i'll need to test this).

Another approach is to add some custom form validation against the (current) model, but i have doubts whether validation is the solution for this?

Thanks for any directions

Paul

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