Is the usa copyright office the only way to prove you own the copyright to a song or can i use a third party copyright service ?

Any creative expression will be covered by copyright law automatically. Then you register the work with the US Copyright Office so to perfect your...

Should I respond to this letter?

Assuming you were honestly fooled, I'm sure you must want the infringer to take the hit and not you. There is no harm in giving them this kind of...

How can I get amazon to pay me back for a book I wrote that got stolen and put on amazon and I have sent them all my papers

I don't really understand the facts. But if you have work that was infringed and posted on Amazon you can send a take down request under the DMCA....

Is it legal to use the "verb form" of a name of an established business as part of your domain name. e.g. "googlinggadgets.com"

As noted by Mr. Ballard, there is no "one answer" here. In general, you are free to use another's trademark descriptively in text (even within...

It is a licensing agreement at the end of the day. Are you sure this content is worth enough to split profits over? In any event, before you...

How does trademark law come into play when companies start expanding merchandise and sell items for marketing purposes?

I'm not entirely sure what you are getting at given the question as posted. The onus is on you to ensure that whatever mark you use has been...

As an artist could I sell other branded clothes with my touch? Same brand but it gains my touch and my artist brand.

Well, as noted, this can get chewy. It is possible and lawful to buy and item, modify that with your own creative contributions then resell the...

Can I parody the Van Halen logo on shirts to sell?

You could be violating the right of privacy and publicity of the players, which are state governed laws that vary. These kick in when one uses the...

As noted, short phrases are not typically protected under copyright, but they can be used as a trademark when they identify the source of a good or...

No, because doing so would be a trademark issue. If the fabric did not have recognizable logos and trademarks on it like Batman, then presumably...