[Seriy]

fabosch, rarely reach-with us. At artslante many artists who do not sell originals, only copies of Didge.
Selling the rights to the image and copy is always a separate contract. If such a contract is concluded, the right of the picture is clear and clearly, by law, belong to the artist-author and he can do with all that it sees fit. Nothing here is not muddy.
With the right heirs also regulated by the copyright laws.

Added after 2 minutes
artcol, why another? investment is the investment of money in the hope of profit. Who said that income should definitely come in the form of physical sales?
Forbes regularly publishes earnings of deceased artists, who have earned the most this year. In this case, no physical action, they certainly could not make - it only about the sale of copyright. The best investment the late Michael Jackson was the purchase of rights to all Beatles songs. No one can even estimate how much they now stand.

Posted 7 minutes
sur, on the forum at one time was the user who printed a fascinating report on gradual advancement of the artist. Alas, I do not remember the name, but I hope someone will tell the thread.