No. But information in a medium can be. But ther are certain exceptions for fair use

Both. An action against infringement by a copyright owner has to be brought, by them, in a civil court, but if a copyright infringement occurs on a “commercial scale” the Government may bring an action in a criminal court See Criminal Aspect of Copyright

Yes. Regardless that it had no indication that it is. Any material contained in a medium, the internet being such, is subject to copyright

Yes, but the material within them may not be if it has expired. See How long does Copyright last

No. As ther is no need to as any material subject to copyright is automatically registered

Yes. As the webinar is being recorded and recordings are specifically indicated as a medium for copyright

NOTE: None of the above questions cover if copyright material can or can not be copied. That is covered in the remaining part of the webinar