Exporting PDFs from Numbers 09

I'm using numbers to create my invoices.
Using sheets/tables to create the Customer information section 2 columns and a few rows for their Name, Address, Email, Etc
Then I use the invoice table chart to put their products and a service charge on there as well.

It works out perfectly...however I just noticed that when I export as PDF to email my customers their invoice/receipt the PDF lines are completely editable.
Giving me a very uneasy feeling should a customer want to make adjustments and cause a concern over something that they changed on the invoice.

So it is possible to lock those fields when exporting as a PDF or is it just by default that way?


Thanks!

 

Gotcha, yeah Im having a tough time locating any sort of functions within the document itself to really secure those fields.

Only password protection for printing is the only option for security when exporting.

Interesting.