<p>Do I need to bring any documents as evidence that my software is legal? Do I need to get them officially translated in English?</p>
<p>I’ll assume you’re international if you’re asking this question. In short: no. Nobody’s going to check your software. The only thing that you might get penalized for is if you’re at college and you try to illegally download a movie or music or a program or something, and somehow your administration catches you. But your programs are yours, and everyone assumes it’s legal until they can prove it’s not (i.e. illegal downloading they catch).</p>