How do I protect (lock) a section of text so that the content cannot be changed?

How do I protect (lock) a section of text so that the content cannot be changed?

Follow these steps to protect a section of text:

• Write or otherwise insert the desired text
• Select the text to be protected
• From the pull down menus, choose Insert → Section
• Select the box next to Protected
• Give the section a name (or take the default name assigned)
• Click  Insert 
• You may also want to create a password on the section. This will keep anyone without the password from removing the protection set on the section.

To insert a password on a protected section:

• From the pull down menus, choose Format → Sections
• Select the name of the desired section (if, applicable)
• Click on the box next to Password protected
• In the dialog that appears, enter a password and confirm the password
• Click  OK  (in the password dialog)
• Click  OK  (in the format section dialog)

Follow these steps to modify a section that you have previously protected:

• From the pull down menus, select Format → Sections
• Enter your password in the dialog that appears (only appears if password protected); Click OK
• Select the name of the desired section (if, applicable)
• Click the  Remove  button
• Click  OK 
• Make the desired changes
• Follow steps in the "protect a section of text" instructions, above, to re-apply the section protection

Once you put a password on a section, you will be prompted for that password before receiving any dialog that might have a chance to access that section of text.