Prevent delete of files from zip

I use a password to zip some files. I can open that zip file using  a 7zip utility and can delete a file. How can I prevent users from doing this? Means, is there anything we can do while zipping that can prevent users from deleting a file from the zip. Any help appreciated.

Update: I cannot delete a file from one of the created zip files. It throws error "Cannot delete a file or folder". Not sure how I created that zip file.  I noticed that each zip entry has its Attribute set to "An". How do I make this happen (means add attribute "An" to each entry). which might solve my problem.