Because the document is confidential documents within the company that could not be disclosed to third parties. But if you really need to write a letter is written with a specific reason for the request.
Because this document is confidential internal company documents, which can not be disclosed to any third party. But if it is really needed Must write a letter in writing stating the reasons for the request.
Because this document is confidential documents within the company that cannot be revealed to the people outside, but if there is demand. To write a letter is written with a specific reason to ask.