help about include classes file on my server into my script please

hello ,
i was looking for the best ways in about licenses, notification and encoding the script, but friend told me about amazing idea .

he told me about leaving one important classes file on my server and making the script execute the classes from it .

so i was wondering about that way will gonna slow down the script loading for the customers or not ???? and what is the best , faster , safer way to do that ??


thanks a lot

Super slowdown on the other end.
Plus, what happens when you move, change you're domain, or go offline? You're software will be given very bad credit when people who purchase it can't use it because you're experiencing networking issues.
In other words, this is a bad idea.

There are a few options out there, but you'll need to install another piece of software in order to make use of them on the actual server. Some customers may go for this idea. Otherwise, extension creation is you're only other option.