Prevent users from modifying web part zone

I faced a problem, when specifying a Data Form View Web Part in the Page Layout Page by using the SharePoint Designer 2007 that user especially contributors can modify web part properties and even close/delete web part from the page. I wanted to allow users (contributors) to update updateable field of the page in Edit Mode, but can only view my web part. Technically, there is no way you can prevent users by modifying/removing web part properties from the browser. I found a very simple way to fix this issue by modifying the properties of the web part zone from the SharePoint Designer 2007.
Follow the steps below to modifying web part zone properties. 

• Open Page Layout Page or web part in the SharePoint Designer 2007
• Select Web Part Zone and right click à Web Part Zone Properties.
• A screen below will pop up. 

 
 
 

 

 

 

 

 

 

 

 

 

 

• The default browser settings of the web part zone are as follows:
  • Allow users to add, remove, resize, and move Web Parts (Checked)
  • Allow users to change personal Web Part settings (Not Checked)
  • Allow users to change Web Part settings for all users (Checked)
• Un-checked all Browser settings for Web Parts contained in the zone as shown in the figure below.