The act of Publishing involves distributing or otherwise making public a visual or literary work. In publishing, the two most important players are publishers and authors. Information is disseminated to the public by publishers. In addition to writers and journalists, the term author is commonly applied to photographers, filmmakers, video artists, and other artists whose work is published. Other publishers typically assign a lawyer to review a publishable work and identify any potential Legal pitfalls. A legal liaison may consult with outside legal counsel to ensure that neither the publisher nor author is embroiled in legal battles. Publishing has many legal issues unique to it, including copyright violations and trademark infringement, sales, advertising, distribution policies, subscription agreements, special sales arrangements, insurance, freedom of speech, tax matters, and antitrust concerns arising from membership in trade associations. Similarly, other employees of publishers, such as editors, should be trained to spot potential legal problems with work and bring them to the attention of the legal liaison before publication.