Besides being under age 18, are there any other restrictions or concerns in connection with "registering" music, for copyright?

The author and the owner of copyright may be different. Since the 16-years old girl is the author she should be declared as such. As to ownership...

I transfered some of my music from Cd's that refuse to work anymore. I own the media, so I know it's legal to do so.

It is most likely illegal You sold your old, used, almost non-functioning CD? that is ok, for any price you could get. However if you sold...

Stolen website account issue

As you state you are an employee of the company and created a website for the company, How they took control is irrelevant, the website belongs to...

Is streaming illegal when the site does not have the rights to stream?

to stream somebody must upload, and somebody must download the material, as I never heard of a movie that does it on its own. therefore both must...

What do i do?

Tortious interference with business, that is the name of the cause of legal action you should bring against the other business for business...

Am I responsible for my users' actions?

You present a question that encompasses several areas of law. Trademark law, Telecom law, personal rights, privacy, and potentially the...

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Do i need written permission to use copyrighted material?

In the case you give as example you most definitely would need permission. No fair usage exemption applies.

If you chop a copyrighted painting to create a puzzle, that once assembled becomes the original painting, you would be creating a derivative work...

1. IT DOES NOT MATTER WHO USES YOUR PRODUCT FOR INFRINGEMENT PURPOSES. 2. If you copy a design you are actually infringing on the creative...

I work at toys r us in CA they saying that i stole a razor scotter and a mp3 because one of my friends went to buy those items

You have posted your question to the section for intellectual property Patent, Trademarks, and Copyright).but your question has to do with theft...