To provide an information distribution managing server, an informa tion providing system, an information providing method and a program thereof for providing only a purchaser of non-digital merchandise with digital merchan dise limitingly and preventing the digital merchandise from being illegally cop ied.

A purchase key generating means 5 issues a purchase key e for digital merchandise b related to non-digital merchandise (a) when the non- digital merchandise (a) is purchased and when payment is made therefor. A purchase key authenticating means 8 allows encoded digital contents c and a decoding key d to be transmitted to a client terminal 104 when a purchase key inputted by a purchase key inputting means 6 coincides with the purchase key e generated by the purchase key generating means 5.