Something that we didn’t get to today (the discussion about patents was probably too marginal, patent law isn’t something we need to worry about) was that when you’re writing critically you are allowed to quote material. This is, technically, a breach of copyright but there is a thing called fair dealing where you can quote something for the purposes of criticism. This does not mean you can also use quotes or extracts outside of criticism, fair dealing only lets us do this for the purposes of criticism.