A production company is responsible for the development and filming of a specific production or media broadcast. Once a final script has been produced by the screenwriters, the production enters into the pre-production phase, most productions never reach this phase for financing or talent reasons. In pre-production, the actors are signed on and prepared for their roles, crew is signed on, shooting
locations are found, sets are built or acquired, and the proper shooting permits are acquired for on location shooting. Actors and crew are hand picked by the producer, director, and casting director, who often use collaborators or referenced personnel to prevent untrusted or unwelcomed people from gaining access to a specific production and compromising the entire production through leaks. Once a production enters into principal photography, it begins filming. Productions are almost never cancelled once they reach this phase. Codenames are often used on bigger productions during filming to conceal the production's shooting locations for both privacy and safety reasons. In many cases, the director, producers, and the leading actors are often the only people with access to a full or majority of a single script. Supporting actors, background actors, and crew often never receive a full copy of a specific script to prevent leaks. Productions are often shot in secured studios, with limited to no public access, but they are also shot on location on secured sets or locations. Due to the exposure, when shooting in public locations, major productions often employ security to ensure the protection of the talent and crew working on a specific production. After filming is completed, the production enters into post production, which is handled by a post production company and overseen by the production company. The editing, musical score, visual effects, re-recording of the dialog, and sound effects are "mixed" to create the final film, which is then screened at the final screening. Marketing is also launched during this phase, such as the release of trailers and posters. Once a final film has been approved, the film is taken over by the distributors, who then release the film.
