How to Lock Postscript For Editing

Dear Experts,

I want to make Postscript that can not be edited. Is there can a Postscript code which can be inside PS file itself , to do so ?

Logic Can be somewhat Like this....

There can be a Date Stamp inside Postscript File. If the File Created or Modified Date Matches with that Date, the File Should Get opened. If somebody tries to edit or modify the content, the File Created Date or Modified Date will get changed and will Not Match the Stamp Date Inside and shall not get opened.

Can it be done ? Kindly comment.

Thanks as Always.

Regards

Riya.