Is watching pirated movies a mortal sin?

I don’t buy pirated movies, nor do I download them. But sometimes when I get together with friends, we watch movies which I’m more or less sure are pirated. I don’t initiate the “watching,” but just tolerate/watch along with my friends. Is it a mortal sin for me to merely watch these pirated movies even if I wasn’t the one who “pirated” them?

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