how can I protect my code ?

[eluser]Unknown[/eluser]
I am developing official applications.
I want to add license or code prevention against theifs.
it may not only against to customer, this protection also can be against hosting compainies which are copying code from your hosting account.

In this case, how can I protect my code and how can I achieve this without losing performance.

Another question in my mind, do I have any change to register my code as a class of system.
I mean, do we have opportinuity to register our base system as a sdk to system?
than anyone can use it?


thanks your anwsers.