javascript - HTML Theft Prevention

Question

I'm working on designing a website, and I want to make sure that no one can steal the code. I would like to prevent the code from being taken out of the website, and display an error message if a user tries to do so.

Answer 1

HTML Obfuscation is a transformational tool that both preserves the code and prevents it from being reverse-engineered. You can find out more about it here.

Here is an example of obfuscated code.

This is extremely simple HTML code:

<a href="mailto:[email protected]">Mail me</a>

This can be turned into this:

<script type="text/javascript">
<!--
var s="=b!isfg>#nbjmup;tpnfpofAepnbjo/dpn#?Nbjm!nf=0b?";
m=""; for (i=0; i<s.length; i++).m+=String.fromCharCode(s.charCodeAt(i)-1); document.write(m);
//-->
</script>
<noscript>
&#13&#10&#60&#97&#32&#104&#114&#101&#102&#61&#34&#109&#97&#105&#108&#116&#111&#58&#115&#111&#109&#101&#111&#110&#101&#64&#100&#111&#109&#97&#105&#110&#46&#99&#111&#109&#34&#62&#77&#97&#105&#108&#32&#109&#101&#60&#47&#97&#62
</noscript>

This is called Combined obfuscation.

<script type="text/javascript">
<!--
var s="=b!isfg>#nbjmup;tpnfpofAepnbjo/dpn#?Nbjm!nf=0b?";
m=""; for (i=0; i<s.length; i++) m+=String.fromCharCode(s.charCodeAt(i)-1); document.write(m);
//-->
</script>
<noscript>
You must enable JavaScript to see this text.
</noscript>

This is called JavaScript obfuscation.

&#13&#10&#60&#97&#32&#104&#114&#101&#102&#61&#34&#109&#97&#105&#108&#116&#111&#58&#115&#111&#109&#101&#111&#110&#101&#64&#100&#111&#109&#97&#105&#110&#46&#99&#111&#109&#34&#62&#77&#97&#105&#108&#32&#109&#101&#60&#47&#97&#62&#13&#10

This is called Character Entities obfuscation.

All of these methods are entirely free on that website, and let you keep all your code private.

EDIT:

After further research, I found another website, JSF**K, which lets you encode items using a series of brackets, parentheses, exclamations and plus signs. Below is how it encodes a simple item:

alert(1)

becomes:

[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+[+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])()

This is practically impossible to crack, as you'd need to "fuzz" the website with data to obtain the character codes and then use regular expressions to build a decoder.