Beerware is a software license, with very relaxed constraints. It gives the user the right to use, modify or distribute a piece of software if the user buys a beer to the software manufacturer; alternatively even drink a beer to the software manufacturer’s honor.

The license was invented by John Bristor 25. april 1987 and the first piece of software released under beerware license was uploaded to a number of bulletin boards in 1987 and 1988 .

Since then there has been released the software under a volume variations of beerware license.