Copyright is a bundle of rights automatically ascribed to the creator of a work of sufficient originality, giving them the exclusive right to copy, alter, distribute, perform, or display the work, or authorize others to do so, for a limited time.
When people say "copyright considerations," they're just talking generally about the agreements and permissions required in using others' protected works.
You need to be aware of your rights and responsibilities as a creator and as a user, and take care not to infringe others' rights.
If they'll sue you and if it's worth it.
Consider whether your use is exempted in the law; if not, you will need the copyright holder's permission.
According to copyright laws in most countries, "musical works" are specifically listed among protected works. The intent of copyright is to encourage creativity, and music is certainly creative.
Yes, websites should be copyrighted. The exact design, layout, and content of a website should be protected in order to prevent any lookalikes.
Reasonably short quotes, properly cited, should be defensible under fair use.
You will find that most material on websites is protected under copyright. The website owner should be able to tell you who the copyright owner is. You would then negotiate a price with the copyright owner to allow you to use their material.
If by "script" you mean "screenplay", you can't get a patent on it. You should be trying to get a copyright. Technically, if your script has been written, it's already protected by U.S. copyright law. Once any original work of authorship is fixed into any tangible medium (in this case, once it's written down), it is protected by copyright. However, to get many substantive protections, you should register your work with the U.S. Copyright Office (see related links). For clarification, you can also see the related links for explanations of the difference between copyright and patent.
Works of sufficient originality are automatically protected by copyright as soon as they are fixed in a tangible medium (more simply, songs are protected as soon as they are recorded). To sell recordings on CD Baby, you will need a mechanical license for anything that is not your own original work.
Translations and editions produced since 1923 would be protected. It should be indicated on the reverse of the title page.
Let people know that you believe your music is protected by copyright: You should always write the international copyright symbol ©, the name of the copyright owner (i.e. you the composer or any publisher to whom the copyright may have been assigned) and the year in which the work was first published (or written if not yet published) in a prominent position on the original and every copy of the work. This will put users on notice of the fact that the work may be protected by copyright
Sure. But keep in mind that since your screenplay was automatically protected by copyright as soon as you wrote it down, this company isn't really giving you anything.
Well yes because as you can get fake phone chargers that explode you could buy a DVD thinking it's copyright protective and then that could explode in there. It could also kill you.
The book is protected by copyright as soon as it is written down; if formal registration is available in your country, you may wish to do so fairly early in the process, as there is generally a significant backlog of applications.
That's a hot topic. The argument for protection is that it's definitely creative work, and the arguments against protection seem to be that clothing consists of "useful articles" which are not protected, and (strangely) that knock-offs are an important part of the industry. As it stands now, your sketches of a dress are protected, but the dress itself isn't. Some designers get around this by registering certain elements as trademarks, or attempting to get design patents for particular aspects of their work. A comprehensive history of this argument in the US is available from the Copyright Office, linked below.