Dif­fer­ent types of free and open source li­cences

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Free and open source soft­ware li­cences can be fur­ther clas­si­fied into copy­left li­cences and per­mis­sive li­cences. Both pro­vide the same set of free­doms as far as us­age, in­spec­tion and mod­i­fi­ca­tion are con­cerned. But the free­dom for re­dis­tri­bu­tion is dif­fer­ent for copy­left li­cences and per­mis­sive li­cences. A copy­left li­cence ex­plic­itly makes sure that a de­rived or mod­i­fied work of free/open source soft­ware also adopts a li­cence sim­i­lar to what ac­com­pa­nied the orig­i­nal soft­ware. The GNU GPL is an ex­am­ple of a copy­left li­cence. Thus, if you adopt GPL for your soft­ware, ev­ery de­riv­a­tive work will also come un­der GPL or a sim­i­lar li­cence. But re­mem­ber, copy­left li­cences are also based on copy­right laws. Fig­ure 1 shows the copy­left sym­bol. The sym­bol alone has no legal va­lid­ity and the great Richard Stall­man him­self crit­i­cised its use in many legal doc­u­ments. Copy­left li­cences are very strict about re­tain­ing the free­doms as­so­ci­ated with soft­ware,

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