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Waite 5.3 Using Public Domain Software in Proprietary Software
“,4 3-iii. ha; speiitl 4 a virus tester. lie finally has .3 dfldnptd ‘O I
M,‘ .hcre c is p can i I . t etccts all the viruses he has ever encountered
‘,5 rq\IIl’5 his system. liarl makes the tester available from his website: anyone Whu
ants it can download it for free. I-sari wants to encourage everyone to use ll. so he
Mg, .1 Creative Commons public domain” license on the software. The license
geafies that anyone can freely copy and ‘use Earl’s software without restrictions. Fail
gm publishes an article in a computer youmal describing how the software works‘
mtg lasper reads the article. downloads a copy of the virus tester from the web-
gg, and figures out how it works. He thinks it is a clever. creative. and useful piece of
software. He also sees how several small changes could be made to the tester. changes
that would make it even better. Because the copy that lake downloaded from the Web
lows him access to the source code. lal“ ‘”3333 lh¢5°_<1’h1″%°5 ‘° ‘h¢hP’°:”‘n:“-‘3:
tin the PI’08Iarn to Earl vvith an exolan‘atior‘i’ <s)tfaI;:atloh:d’Ii: as pr;’Pfl-
meets his revision of the program ‘with =‘CoPY”8h » “L H mm“ describe WM
softwa:efromhiswebsite.laluesUsersManual3n
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uh . . E””°nh¢o,5gjmlsoftware.Earlisa itrni
done. and give credit to . don,
my I-ggogmzes that whatlakclw
l*IndlingtherevisedsoItwatve.alth°’1_ 5″ imomwubm domm
unqlady legal because put his soaftwmfl _ _ ed in mums gm the situation
fiilhkedoneanytlungvllbflsn’ . ’. nmotfeghisrevisiontothepublfi
fiT;’II‘lBt unfiil’? Does lake have in oH’3‘“°

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