I want to ask a stupid question. I have a project, and I want to protect it. I'm afraid anyone on the internet can see, get or modify it or something like that. How can I do?
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As long as you don't run a server, there shouldn't be any real fear of having your project stolen.
I believe that, in order to be 100% sure though, go offline any time you work on your project, and, when you want to go online, just encrypt its source files using TrueCrypt
or, even better, have your project files into a USB stick and edit them through there and unplug your USB stick every time. With the latter way, I recommend having your data backed up to an external offline disk, as well.