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For the life of the author plus 50 years at least; the US and some other countries have extended this to life plus 70 years.
The exact answer will depend upon whether the letters were published, when they were published, and whether the publication conformed to the formal rules for copyright in effect at the time. Also, if the author is anonymous, the letters will be copyrighted for 120 years from creation, unless created prior to 1978 and published (which could mean copyright of 28, 56 or 95 years).
What else can I help you with?
Is it illegal to make a movie out of pictures in the Internet?
As long as the pictures are not protected by copyrights. Pictures (and clips) you download or save to your computer can be manipulated as long as you do not infringe on copyrights of material used.
Who is protected by copyrights?
Creators of original works are protected.
Is Jane Austen's work and letters subject to copyright?
The copyrights on Jane Austen's work have long since expired.
Is the Star Spangled Banner song protected by copyrights?
No, it is in the public domain.
Are there copyrights on fraternity Greek letters?
Something that short cannot be protected by copyright, but most fraternal organizations have registered their names as trademarks. "AKA" for example is registered to Alpha Kappa Alpha Sorority, Incorporated.
Is the Copyrights of Microsoft Office97 Expired?
No; as a corporate work, it will be protected for 95 years.
What is the copyrights for a poem?
Poems are protected for the life of the author plus 70 years.
Is the movie Singing in the Rain public domain or copyright protected?
The 1952 movie is protected by copyright, and will likely be protected through 2047.
How long do copyrights last on phone books?
The compilation of the book is protected in the US for 95 years from publication. Note that it has been established that the mere listing of numbers is not protected; see Feist v. Rural, linked below.
Are there copyrights on miniature figures?
Yes; they may also be protected by copyright in some cases.
What does the law say about copyrights?
When a licensed product has a copyright protected sign, it is protected from being copied by other companies. "Protected by law" Watch MANNY AND LOLA on facebook
How to get copyrights?
Works of sufficient creativity are automatically protected by copyright as soon as they are fixed in a tangible medium.
