EncodePermission - Issue with CanFillFields

Hi Everybody :)

is here somebody made similar experiences as i get today?
I wanted to temporary protect formfields with EncodePermissions setting CanFillFields to 0.
What i don't want is to set all other options especially CanChange and CanAddNotes to be forbidden.
This wasn't possible for me - if i set CanChange and CanAddNotes to 1 (means allowed) CanFillFields is allowed, too. Even if the option is 0.
If i use the following code line form fields can't be maintained but the other options are not allowed, too.
EncodePermissions(1, 1, 0, 0, 0, 0, 0, 1); // CanPrint, CanCopy, CanChange, CanAddNotes, CanFillFields, CanCopyAccess, CanAssemble, CanPrintFull
Even if i only set CanAddNotes to 1 (like the following line) form fields are fillable again - obviously CanFillFields is  set to 0.
EncodePermissions(1, 1, 0, 1, 0, 0, 0, 1); // CanPrint, CanCopy, CanChange, CanAddNotes, CanFillFields, CanCopyAccess, CanAssemble, CanPrintFull
before EncodePermission Decrypt is running and after EncodePermission Encrypt with 128 bit/rc4 is running.
I'm using QuickPDF 18.11 with Delphi XE3 on Windows 10.
Thanks in advance for any helping hints.

Cheers,Ingo