Hi, I'd like to know if I can use a trademark that's been dead since 1993 and it's the same name just in the plural.

yes if the prior owner has abandoned their use of the mark as well as all others

Does having ownership of Estate include the copyright of books that was authored by the Man who passed down the Estate?

I suggest you speak with both a copyright and an estate attorney to ascertain the ownership question

Can a second provisional patent, be applied for, on the same invention; before the year runs out.

yes, if the invention pertaining to the first provisional filing has not triggered an on sale bar. I suggest you seek the counsel of a patent...

You are asking a question that is best answered by attorney's in another practice area. Therefore, I will redirect your question.

Is there federal statute similar to 47 U.S.C. §605 and §553 but applicable to Internet as a mean of interception?

Contact an internet attorney who is knowledgeable about internet and privacy laws to guide you in this matter.

For trademark infringement, do company's usually send cease and desist letters first, or do they automatically file a complaint?

Depends since it's a subjective decision made by the owner of the mark in counsel with their Trademark Attorney.

Is client addresses considered trade secrets?

I agree with Attorney Ballard, you need to protect yourself in this instance, seek a local attorney that can counsel you in this matter

Does publishing a play or a story on a website constitute ownership?

Yes, they have a common law copyright at the moment of creation and I recommend they also seek Federal registration, see a copyright attorney for help

Copyright of translation content.

It would seem that your translation is being used without you having being paid for your services. I suggest you seek the counsel of a...

FTC ruling on "Free to Play" wording on 'freemium' game advertisements?

I suggest to seek the counsel of an intellectual property attorney who can review your game with respect to your advertising and monetization.