It's a shame there is not a law that allows software to be used freely
after x years of no new updates.
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If older software is no longer of commercial gain to the
developer(s),he/she/they can always declare it to be licensed under the
GPL = General Public Licence as established through the Free Software
Foundation . Under the GPL the software can then be modified , sold by
anybody which MIGHT extends its useful life.
Much Linux software is covered by the GPL (current version 3)

Frank GM0CSZ / KN6WH