Yes And No! Users Can Report that and the Supervisors or other members can remove the hole post. As long as the member uses this text it is not Copyrighted.
Both kinds of information appear on the web, although copyrighted content is more common.
Regretably, no, as they are copyrighted content.
You would need to gain permission to use copyrighted content if you are going to make money from it. Generally, you can use copyrighted content (covering songs and such) if you make no money from it. The copyright holders might put adverts on your video so that they make money from it instead.
It is still copyrighted. There's no exception for things that are out of print or unavailable.
If it is copyrighted content, yes.
There is no magic number for the amount of copyrighted content used that will lead to a copyright notification. Fair use is a very ambiguous rule and is judged on a case-by-case basis. To be safe, avoid using any copyrighted content in your videos at all.
If it does not contains any copyrighted content, such as BIOS/Firmware, yes.
Yes. If the content of the CD is copyrighted, it is illegal.
It definitely is NOT. Many companies post images, logos, and stories that are copyrighted. MOST government websites have content that is not copyrighted, some will have content that IS copyrighted, and used with permission of the owner. When reading an article, or viewing images, scroll down- you may see a notice that says something like "All rights reserved" and the c in a circle symbol that means copyrighted- and a date. That is NOT public domain.
Yes, soundtrack in YouTube videos is copyrighted. If you want to use somebody else's content, you must get permission from them in order to avoid getting into any sort of trouble with copyright.
No, it is unlikely that any content Sega owns would not be copyrighted. Should you want to use the soundtrack, make sure to contact the copyright owner about it.
Not in the United States, unless you pladiarize copyrighted content.