Material published on the internet is protected by the same laws of copyright which apply to books, videos and music.
The right to "copy" always remains with the owner of the material. Unless expressly stated otherwise, you are not permitted to copy or republish anything you find on the internet without the copyright owner's permission.
Under Australian copyright law, limited quotation is permissible in the context of genuine review and criticism. However this does not permit extensive quoting of song lyrics etc.
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