Protect dll from Use

Hi
I was search all this week about someway to protect dll files from use
from unauthorized user, that when I create library in C#.net and put
my methods in dll files I want just me to use this dll.
but when distribute last executable program that use this dll, maybe
someone take this dll and use it.

I read about StrongNameIdentityPermissionAttribute in Microsoft CAS
http://msdn.microsoft.com/en-us/library/system.security.permissions.s...

but they said it not useful in .net framework 3.5 and protect way just
used in old release
then I read about Publisher Certifications and try it using test
certificate but it look like it just use to make my application from
known source not to protect dll from use..

I appreciate any help in this field
Thanks in advance

Regards
Essam
.

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