Ready-made script for protecting Javascript code from copying and binding it to a specific domain or domains.

For example, You have developed a script for a certain site "site.ru". You don't want someone "Unknown" to take and steal your script and then install it on your site. To prevent this from happening, you need to protect your Javascript code from copying.

======== How the JavaScript code copy protection script works

This script determines the domain name of the site where it was launched and compares it with the allowed domains specified in the script settings. If the domain is allowed, the script continues its execution. If the script was copied and installed on someone else's site, the protected code block is not executed. Instead, a fake block of code can be executed that is specially added to the script. Or, the script can simply do nothing and quietly stop working.
In the script there is an array of allowed domains and two functions. A protected code is inserted into one function, and a fake script is inserted into another.


= = = = = = = Obfuscation of code and additional protection of the Javascript script from copying

Since the script is open source, it is advisable to hide it inside the protected Javascript code. For even more reliable protection, it is recommended to perform obfuscation (encoding, obfuscation) of the resulting code. To do this, you can use one of the many specialized online services on the Internet. After this protection, javascript code intended for one site cannot be run on another site.

======== Result of protecting the Javascript script from copying

These methods of protecting javascript code from copying are quite effective against most ordinary website owners, but they do not provide a 100% guarantee against hacking by professional javascript programmers. And, as a rule, it is easier for programmers to write such a script on their own than to spend time hacking and analyzing your protected and obfuscated code.