Create a read-only file

Question

I was wondering wether it is possible to create or simulate a file with a content set at creation and the assurance that nobody can ever change the file. If possible, can I

Answer 1

Read-only way can be useful altough it is not impossible to change or crack.So if you can not create an unreachable file then you can convert its contents to not understandable thanks to some kind of Encryption algorithms.For example AES may be so usefull.