How do you enforce software license in javascript? [closed]

Question

I was looking at a javascript framework that looks pretty cool. I like the demos, when I looked at the page source and the attached .js file, I noticed the file has this "testing and evaluation purposes only, protected by copyright, this software is not free and is licensed to you for testing only"

but right under that, the entire code is there (because it is javascript). I could see if you had a compiled project and someone would have to break into a system unauthorized to get the source code, but how would you even begin to enforce a plain text language like this?

After removing their comments, find+replace renaming of the variables, re-arranging the functions, it would be impossible to even know if someone was using it with a web spider. Thats a 5 second way to lose business.

I am genuinely curious because this product seems to be their entire business plan, but all their trade secrets are available in plain within the demo. The country does not provide for adequate remedies for this sort of thing so the burden is on the creator to protect it (I mean if that is their business plan after all)

Do you have any insight into this? Solutions I completely overlooked? I am little perplexed on why someone would devote so much effort into something that they don't intend to be free, but are giving it away for free.

Answer 1

There is no way to "encrypt" JavaScript code other than obfuscating it so yes, it's true there is no way to reliably copy-protect a commercial JavaScript product.

They are still worth offering because

• Most corporate customers in western countries will not dare risk steal software due to the risk of getting caught and sued for vast amounts of money - if not through the code, then maybe through a disgruntled intern blowing the whistle

• Different from pirated office software, the theft is publicly just as visible and accessible as the original piece of JavaScript - you never know what techniques may exist (or come up) to find stolen JavaScript code using an algorithmic approach.

• The real loss of business is probably not as heavy as one might think: People cheap enough to steal a JavaScript widget would simply fall back to a free one if that one wouldn't be available to steal. Commercial JavaScript widgets usually don't offer any unique functionality - popular things tend to get cloned quickly - their selling point is usually that they do what dozens of Open Source solutions do too, but extremely well, fast, cleanly, and well-documented.

Answer 2

There's always obfustication tools: http://www.javascriptobfuscator.com/default.aspx

This so question throughly hashes out (pun intended) the pros AND cons of obfustication practices