How to protect digital goods from resale?

Question

CMS

Specifically:
We are developing websites.
We make websites for specific clients under a license for 1 domain.
Question:
how can I organize the sale of digital files (websites) so that they work only on specific domains? Are there ready-made solutions?

Answer 1

If php is used then:
Zend Guard - definitely supports
IonCube domain limit - should also

Answer 2

Here is the finished solution for you:
obfuscate this code and paste it into some file that is always included (something like a config) and that's it.

Answer 3

In fact, code protection is an eternal song!
Zend Guard and IonCube can be decoded. For example, a rewritten php interpreter. All obfuscators work on the same principle: before passing clean code to the compiler, any extension like Zend Optimizer or IonCube decodes it so that PHP can lexically analyze and do everything necessary to translate it into bytecode. Rewritten interpreters, just instead of "resulting" they save "pure" php code to the specified file. I studied such things 5-6 years ago. But even at that time, the guys from Zend compressed it beyond recognition before obfuscation, but you could spend a couple of hours and restore the source code of most files. Let's just say...these are very good and reliable tools, but there were ways to steal,

Answer 4

How technically does the installation logic of these tools look like?
and what is the output?