Even if the mark is not used today, many still are as noted, it can still be a problem if you present a false association with any given trademark...

How to sponsor a friend?

I retagged this question to immigration so those lawyers with this expertise can respond.

Can I sell My clothes that are gently used and some that have never been used?

Sure, you just can cause any market confusion regards to the source of those gently used clothes you are selling. If you are considering your...

Can I trademark a 6 word phrase that would be the only phrase used on any product I ever sold?

Are you using the phrase as a tagline or slogan that identifies a good or service in commerce (e.g., "Just Do It" or "An educated consumer is our...

Would it be considered copyright if I were to download free passages and make them into a workbook for students?

As noted, if the platform from where you are getting the content has the authority to grant a license just follow those terms and make sure you can...

Would it be an issue selling imitated-design products?

I'm not sure what you are describing exactly. If these are counterfeit then you would be infringing both here in the US as well as in S. Korea....

Are you absolutely certain that the product is legit and not counterfeit? Does the person have the right to sell it to you or is there any concern...

There are no laws that prohibit the watching of infringing content. As noted, it can be a problem if you are caught downloading the content.

Can I buy a branded clothing item, such as Limited Too jackets or Nike, and put my company's logo on it for students I teach?

As noted, so long as that is not causing any market confusion regards to the source of that product. Otherwise, this is exactly the business model...

As noted, there is no percentage or word count rule. If the material is protected under copyright then the analysis is called "substantial...