No; registration is not required for protection.
Your problem isn't as much with copyright as it is with trademark. The images you describe (Disney, MLB, NFL, NBA etc logos) are, in all likelihood, trademarked to their respective companies and while a copyright infringement might be overlooked a trademark must be "vigorously defended" or the owner risks losing control of the mark.
It depends on the nature of the presentation, and how the images fit in. If the use of the images is transformative, that would be covered under copyright law (for example, if your presentation is for educational purposes, and is discussing use of color in corporate logos, including the logos would be defensible under fair use). But using an unlicensed stock photo of a man breaking a pencil to illustrate a presentation on workplace stress is likely to be found to be infringing.
AnswerNo. All NFL logos are protected by, in some cases, both trademark and copyright law.
Logos used to identify companies are usually protected by copyright. The answer to how to use a logo in a sentence is... you don't. Spell out the company name within a sentence or headline and use the logomark elsewhere as support.
as long as said company has permission or owns copyright then it is legal otherwise it is infringing on copyright
As an image, a logo is automatically protected by copyright as soon as it is fixed in a tangible medium. If you want to use it in commerce, you may wish to register it as a trademark.
Materials are not required to have a notification on them in order to be protected.
It is an image that has been put as copyright. This means others may not use this image without permission, or legal action can be taken.
No. Unless a "fair use" exception applies use of someone elses copyrighted property without permisson is the definition of copyright infringement.
Stock photos are images that are available for free. If you see these kinds of photos, then they are safe to use without copyright infringement.
No. It is illegal to use someone's images from Photobucket or from anywhere (either digital or not) without written permission from whoever owns the copyright to that image. It is usually, but not always, the photographer who took the image that retains the copyright.
NO THEY ARE NOT!! The results of a BING image search returns images from the Internet, but that DOES NOT MEAN that they are yours for the taking! These images are not free for anyone to swipe. They are the copyright of their respective owners, and if you use use them without permission, you can be subject to lawsuit for copyright infringement.