Protecting DLL files from use.

Question

I have a dll which I have written that contains code for encrypting and decrypting strings, how would I go about preventing its use by someone else who say... writes another .NET application and then attempts to include the methods from that library by referencing it?

Rohit K · Answer

Code Access Security is the solution. See the link below: http://www.codeproject.com/KB/security/UB_CAS_NET.aspx

Bechir Bejaoui · Answer

Make use of the System.Security; decorate your code by this attribute [assembly:FileIOPermission(Security.Action.RequestMinimumUnresticted.True)|SecurityPermission(SecurityAction.RequestRefuse SkipVerification = false)]