Is it illegal to use content that infringes copyright?

No, if you are just using an infringing product you are not exposed to any legal action unless there is some evidence of contributory infringement...

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I want to write and self-publish a book on how to use a software package. Do I need the software vendor's permission to do so?

You are free to write on that topic and using the trademarks of another descriptively in text is not an infringement on its own. The real problems...

Are there any copyright problems if you use a quote with the person's name who said the comment on items you intend to sell?

Using quotes will generally be permitted. This is largely because using what amounts to a very small portion of a much larger body of work will not...

Trademark or Registered trademark on a business name.

It is good that you have done some of your own homework here, but you certainly cannot rely on your searches alone nor your own analysis. The logo...

I am creating a line of Hoodies. My first name is Royce. I call my Hoodies Rose Royce of Hoodies. Do I need a trademark?

So Rose Royce of Hoodies is your trademark in this context, but whether you can use it is another question. The fact that Rolls Royce is such a...

Intellectual property and free public information. Creating a service based on public information.

There is no claim to factual information available in public databases, but as you note there are terms and conditions that apply to using various...

I want to register a trademark for a domain name.

I really think there is a fundamental misunderstanding here about how all this works. I would start with having a proper clearance done here in the...

Is it legal to buy, sell, use, or make "hoverboards" now that Razor USA LLC has obtained exclusive rights to the patent?

Of course you run a risk if it turns out the products you sell are infringing. It is not likely a small retainer will face any issue, but certainly...

Do I need to choose a new business name or can I buy the rights of the name/site I want to use since the business is now closed?

This is of course a trademark concern and merely registering a business with the state or county or acquiring a domain conveys no right to use that...

Everyone offered a good response to your substantive question. I would only add here that handling the actual filing is not the first step in the...