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In entertainment, for legal reasons it is common for production companies not to accept unsolicited materials from any other company, talent, or person from the general public. It is also common for filmmakers or producers to become entrepreneurs and open their own production companies so that they can have more control over their careers and pay, while also acting as an "in house" creative and business driving force for their company; while continuing to freelance as an artist for other companies, if desired.
Read more about this topic: Production Company