Do i need to seek legal advice

Absolutely you need to consult with an attorney if you are being sued. If you don't, you will be sorry. That said, what the attorney should...

I received a cease & desist letter alleging copyright infringement. How can I verify that the sender really owns the copyright?

The simple answer is yes, you can ask for proof. They don't have to give it to you, but you can ask. Send them back a deferential letter saying...

If I trademark "The Groovy Tee Company" & "Groovy Tees", can I stop other companies from calling their shirts "Groovy Tees" ?

Ms. Koslyn is, of course, right. You get trademark rights from use, not by registering. So if anything, they could stop you from using the mark...

Does The Applicant For A Pending Patent Have Any Legal Basis For Demanding That Others Stop Selling The Patented Product?

No, they don't have a legal basis to demand that you stop until the patent issues. But they can get damages from the time they put you on notice...

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How Should I Respond To A Cease & Desist Letter Alleging General Copyright Infringement Without A List Of Infringing Items?

Ms. Koslyn is right. You should hire a lawyer to respond. You are apparently confusing the DMCA takedown provisions with copyright infringement....

Should I try to make restitution with the production company of the TV Series I bought from illegal site www.tvdvdboxsets.com?

You appear to be feeling very guilty about this. Understand that as things appear, you didn't do anything wrong. It appears you just bought a...

Can I freely publish a translation of a foreign work if the authors are dead and the publisher is gone?

The answer is not so clear. With the dates you give, the copyright in the original work is likely still in existence and will be for many more...

I bought a TV Series DVD Box set online, and when it arrived, I saw it was a copied series. Should I return it?

Well, I wouldn't send it back. First, there is no "Berne Act." That's an internet myth. There is a Berne Convention, but it says pretty much...

We want to sell our patent for $160,000000 we know its worth it can some one call us 615,596,0215

It's an interesting patent. But it's worth nowhere near what you are asking for it.

Yes, so as stated above, there is absolutely nothing "illegal" or even in violation of any law against plagiarizing yourself. What you have done...