Document Protection is disabled

Q

qwer1304

I have a document which has disabled forms.
I open the document and then Unprotect it.
I enter the correct password.
I do some changes in the document.
I try to protect it again by invoking Protect Document wizzard.
The wizzard opens and I fill all the fields.

BUT, the "Yes, Start Enforcing Protection" is disabled.

What should I do?
 
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