Checkbox disappear - Page 1

I have a php script with lots of checkbox in, they should not go to edit, but should only appear in the pdf document. Checkbox is disabled and everything works as it should. Except when I create a pdf, all checkbox can be clicked on a pdf file or if I put protect print on the pdf file disappears all checkbox.
Does anyone have a solution to this problem?
Excuse my bad English.

Fixed.

I use php and image <?php if (!(strcmp($row_Recordset2['Byggnad'],1))) {echo '<img src="../images/1.png" width="12" height="12" />';} else {echo '<img src="../images/0.png" width="12" height="12" />';} ?>
And it works perfect.

yes, you have not to use checkbox, if you don't whan a dynamic form