To deploy COM DLLs, place them along with their supporting DLLs in the system32 directory of the target machine. This will assure that all deployed applications that use LEADTOOLS will maintain functionality, should another application using LEADTOOLS be installed on the same machine.
To deploy API DLLs, place them in either the system32 or the application's directory.
To deploy .NET DLLs, place them in the GAC or in the application Directory.