A copyright notice indicates the year of publication, and the name of the rightsholder. Although it can be helpful for identifying the person or organziation you need to contact in order to use the work, it's not required for protection.
It is possible that Charter has sent you a notice of copyright infringement.
I have not received a Spectrum copyright infringement notice.
Copyright protection is automatic, there is no special action required to copyright a play. As soon as a work of sufficient originality is "fixed in a tangible medium, perceptible to human eye, machine reader or other device". There is no requirement to register or to display a copyright notice for a work to be protected.
Development of automobiles was affected more by patent than copyright.
The copyright notice and other cataloging data is usually on the reverse of the title page.
Same as copyright notice for anything else: Copyright, or copr. or circle-C, the date of copyright and the author or other copyright owner's name. E.g., "Copyright 2012 Walt Disney Productions, Inc."
It can be. Notification is not required for protection.
A notice can be added as soon as the project is complete, even before registration.
I have not received a notice of copyright infringement related to the use of spectrum.
If you have received a notice of copyright infringement from Spectrum, it means they believe you have violated copyright laws by using or sharing protected material without permission.
They were required to implement technology to interpret copyright protection information and to prohibit playing unauthorized copies.
Yes.