HOW TO MAKE A FILE (crystal p.d.f , genuine excel, word) AS READ-ONLY FILE????..using C#

Question

Hai to one and all please help me....
in my project i have generate crystal reports(pdf), genuine excel reports, word reports as per search options
now i want generate these reports with READ - ONLY files
(i.e this read - only file with no downloading , no editing no printing options)

please help me ..thanks to all .....helpppppppp.......