Under the SPP, the artist announces that when a certain amount of money is received in escrow, the artist will release a work (book, music, software, etc.) into the public domain or under a free content license. Interested donors make their donations to a publisher, who contracts with the artist for the work’s creation and keeps the donations in escrow, identified by their donors, until the work is released. If the artist releases the work on time, the artist receives payment from the escrow fund. If not, the publisher repays the donors, possibly with interest. As detailed above, contributions may also be refunded if the threshold is not reached within a reasonable expiring date. The assessed threshold also includes a fee which compensates the publisher for costs and assumption of risks.