Explain to me the village!

[Вильгельмина]

Comrades guru and other dedicated .... Explain to me the village than the author's lithograph ( certificate) is different from simply lithography.
The fact that my husband 's father gave them a copyright 500 lithographs by Chagall (as there is a document in a foreign language - in-law a foreigner ) .
Husband inexplicably this picture on your nerves , he does not mind to sell it , but the issue price floating in the air . There has been paid Nemer ( by their standards ) 1500 euros ... ( vsezhki wedding gift ) , surprised that so ruined .... Here the price is not clear , and where to take too ....
So back to the beginning - the author lithography ( certificate) is different from simply lithography. Explain the farm , please! <! - ~ 1 ~ ->