storing data securely

[ek1]

Hi,

I need a method in which to store data securely on windows XP/2003
using C#.

By secure I want to a) prevent user reading and changing the data and
b) prevent user copying over data

I can solve the first problem easily by using encryption, however I do
not know of any storage method which cannot be copied over. For example
files may be copied over, registry keys can be restored. If I cannot
prevent a user copying over my data I want to be able to at least
determine that the user has done so using. Anyone have any suggestions?
Is there a secure storage area in Windows?

Thanks.

 

[ek1]

by the wat the c# program will be installed to a users PC, so I cannot
solve this using permissions.

 

[adamgilmore]

Take a look at

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/SecNetHT07.asp