Not at all! In 90% of legal systems copyright applies automatically and not having a license makes your software closed source by default. The concept of copyr

Not at all! In 90% of legal systems copyright applies automatically and not having a license makes your software closed source by default. The concept of copyright existed long before software licenses and long before the (c) symbol. It often applies automatically if you sing a song in a park, scribble an article on a napkin, paint a giraffe on your car - no matter how "casual" your artwork might seem.