Cities recieve tons material from writers pitching their creative work.   An image is important.
Handing a Publisher or Producer your portfolio with a professional (c) backed by
Entertainment Law creates an overall impression for your work and their offer.
Writers have been known to mail an unsealed letter to themself then rewrite their work for years finally sealing their envelope as a (c) by date on the Stamp.   For court, was the envelope ink compared with paper signature for matching age?   Can this envelope pass in court as an untampered copyright?
You are in front of a Publisher or Producer and open your sealed envelope to prove you have a (c) hoping for a deal.   They change their mind and you stand there holding a piece of paper with an unsealed envelope and NO (C)
"Get a (c) thru our Entertainment Law"