Sites like hotscript.com offer tons of scripts you can download for free or a fee. Are those scripts useful for programmers? For example, you can implement such a script into your program and modify it to your needs.
But some of the scripts seems kind of shaddy..
I personally would never copy such a script verbatim.
Almost all of them will have one central idea or "trick" that is the key to figuring out the problem you had - I'd take that idea and write my own code around it.
You're less likely to run into code ownership issues, you learn more about what you're doing, and it just looks much more professional. Plus you're less likely to inadvertently copy a backdoor into your code :-p