What is the ruling on quoting from internet sites?

It is permissible to quote from books, magazines, and the internet, provided there is honesty and the quotation is clearly attributed to its author. The permission of the text's owner is not required; rather, quoting is permissible even if the owner explicitly forbids it. This is because quoting is a legitimate benefit that Muslims have practiced since authorship became known. A prohibition by the author is considered a breach of consensus and holds no weight.