If you wanted to protect your strats/code you can do it with CliSecure. It turns your strats into protected DLL files that cannot be modified and it's free if you have a Ninja license as the company will provide a license for free to NinjaTrader users after registering on their site.

Protection/DLL Security

Also, here's free open-source encryption software that I use: TrueCrypt - Free Open-Source On-The-Fly Disk Encryption Software for Windows 7/Vista/XP, Mac OS X and Linux

Please use the existing thread on this:

Securing Your NinjaTrader Code with CliSecure - Full Version Hi All I'm posting this here & on the Ninja forum. I've been asked by a few people how to secure NinjaTrader code with CliSecure. Whilst I am no expert, it appears I might just be ahead of the curve. My apps consist of NinjaScript and C# code …

Mike