Can I?

So in general, any creative expression will be covered by copyright law automatically. Then you register the work with the US Copyright Office so...

If someone wants to name a park after my deceased grandfather and use his name to raise money can I prevent them?

It really does depend. They could be violating his right of privacy and publicity, which are state governed laws that vary. These kick in when one...

If I unintentionally copied a copyrighted work, can I just destroy the copy?

I don't think I would be too concerned about one photo, but sure you can take the images down now. If you are contacted by anyone about this, I...

Can I sell a product that employs another company's product? (Sell a cowbell metronome with another companies cowbell)

Usually, this is not going to be a problem. In some cases, manufacturers even boast the name brand components in their products (made with X brand...

If someone violates my copyright, and I tell their employer, would I violate invasion of privacy/intentional interference?

You should make certain you have viable claims before making this kind of conflict. For example, if it turned out that you really do not have a...

As noted, this definitely gives raise to copyright infringement issues. Before you commit to anything, I suggest that you consult with a lawyer...

Can you sue a nonprofit organization if they use your trademark without your permission ?

Being a non-profit does not exempt you from IP law, but before you take any action you need to get some proper advice here. I suggest that you...

No, you can't just use what you find online. You have to assume all of those images are protected. You can find royalty free images to use online,...

Yes, that is possible. Before you invest in any trademark make sure you get some legal guidance upfront. It is of course best practice to clear...

As noted, the short phrase would not be covered under copyright unless this is a very recognizable part of a longer work like the chorus of famous...