copyleft
Share-alike software terms
Copyleft is a licensing approach that allows free use, modification, and distribution of creative work—typically software—on the condition that derivative works carry the same freedoms.
The term plays on copyright: where copyright restricts, copyleft requires openness to persist.
The Linux kernel is released under a copyleft license.
Software under copyleft can be copied and changed, but the changes must remain freely available.
Open source license type
- GNURecursive-acronym operating system
- Creative CommonsNonprofit providing sharing licenses
- share-alikeLicensing reciprocity requirement
- attributionAssigning origin or cause
permissive · restrictive · reciprocal · viral · hereditary · persistent · propagating · derivative works
Unshackled, in Romance languages
- free softwarePrograms costing nothing
- user rightsPermitted system actions
- unrestrictedHaving no limitations
- unencumberedFree from hindrances
open access · democratization · empowerment · autonomy · self-determination · digital rights · liberté
Programming instructions before compilation
- open sourcePublicly accessible code
- discloseReveal hidden information
- transparencyState of being see-through
- inspectionFormal assessment of condition
audit · reproducibility · compile · build · repository · codebase · readable · modifiable
Licensing reciprocity requirement
- redistributionSharing out again differently
- derivative worksWorks based on originals
- remixAltered version of recording
- forkTined eating tool
modify · adapt · downstream · upstream · viral sharing · propagate · circulate · disseminate
Formal grant of permission
- intellectual propertyLegal rights over inventions
- enforcementCompelling compliance with rules
- violationBreaking of rules
- infringementViolation of rights
compliance · litigation · revocation · termination · contractual · statutory
Software freedom advocacy nonprofit
- EFFDigital rights advocacy organization
- activismDirect effort for reform
- advocacyPleading for a cause
- philosophyStudy of fundamental truths
GPL
Open source license type
- GNURecursive-acronym operating system
- Creative CommonsNonprofit providing sharing licenses
- share-alikeLicensing reciprocity requirement
attribution · permissive · restrictive · reciprocal · viral · hereditary · persistent · propagating · derivative works · redistribution
libre
Unshackled, in Romance languages
- free softwarePrograms costing nothing
- user rightsPermitted system actions
- unrestrictedHaving no limitations
unencumbered · open access · democratization · empowerment · autonomy · self-determination · digital rights · liberté
source code
Programming instructions before compilation
- open sourcePublicly accessible code
- discloseReveal hidden information
- transparencyState of being see-through
inspection · audit · reproducibility · compile · build · repository · codebase · readable · modifiable · hackable
share-alike
Licensing reciprocity requirement
- redistributionSharing out again differently
- derivative worksWorks based on originals
- remixAltered version of recording
fork · modify · adapt · downstream · upstream · viral sharing · propagate · circulate · disseminate · reuse
license
Formal grant of permission
- intellectual propertyLegal rights over inventions
- enforcementCompelling compliance with rules
- violationBreaking of rules
infringement · compliance · litigation · revocation · termination · contractual · statutory
Free Software Foundation
Software freedom advocacy nonprofit
- copyleftGPL, share-alike, Creative Commons, libre, free software
- copyrightinfringement, public domain, fair use, reproduction rights, exclusive rights
- open commonscommons, open source, open access, open data, Creative Commons
- Open LicensingCreative Commons, public domain, open source, free software, attribution
- open sourceGNU, open source software, free software, GPL, forks
- software licensingsoftware license, license agreement, EULA, license key, licensee
copyleftall rights reserved
Legal claim on content
copyright · closed source · proprietary software · trade secret · public domain
copyleftcopyright
Exclusive reproduction rights
all rights reserved · intellectual property · proprietary rights · patent · trade secret
copy, left, copyright, copyrights, copyrighted, copyrighting