Licensing update/License comparison/th

ตารางด้านล่างเป็นข้อสรุปของข้อเหมือนและข้อแตกต่างระหว่างสัญญาอนุญาต GNU Free Documentation License (GFDL) และ Creative Commons Attribution-Share Alike 3.0 (CC-BY-SA)

GFDL CC-BY-SA
ผู้สร้างสัญญาอนุญาต Free Software Foundation Creative Commons
รุ่นปัจจุบัน 1.3 (พฤศจิกายน พ.ศ. 2551) 3.0 (กุมภาพันธ์ พ.ศ. 2550)
รุ่นก่อนหน้า 1.2 (พฤศจิกายน พ.ศ. 2545)
1.1 (มีนาคม พ.ศ. 2543)
2.5 (ฤดูใบไม้ร่วง พ.ศ. 2548)
2.0 (พฤษภาคม พ.ศ. 2547)
1.0 (ธันวาคม พ.ศ. 2545)
ออกแบบสำหรับ เอกสารซอฟต์แวร์เสรี ใช้ทั่วไป
Languages and jurisdictions English language developed with United States jurisdictional context; no official translation, several unofficial translations One generic version and more than 50 mutually compatible variants adapted for specific national jurisdictions and translated into the respective official languages
Attribution Title page includes current authors and at least five principal authors of previous versions. Document must also include a history of all prior versions, their authors, and their network location (if any) Current and previous authors and their designated sponsor institutions (if provided), title of work, URI associated with the work (if provided), acknowledgment of adaptation from prior work (if any).
Attribution placement Attribution must physically accompany all copies Attribution may by conveyed via any "reasonable means"
Copies must also include The GFDL text, licensing notice, and all copyright notices The CC-BY-SA text or a URI pointing to it, licensing notice, and all copyright notices (unless waived by the original authors)
Derivative works Must be licensed under the GFDL Must be licensed under CC-BY-SA
Aggregation May be combined with "separate and independent" works in a "storage or distribution medium" without requiring the GFDL apply to the other works May be "assembled into a collective whole" with one or more "separate and independent works" without requiring that CC-BY-SA apply to the other works
Copy prevention mechanisms A re-distributor "may not use technical measures to obstruct or control the reading or further copying" of the work A re-distributor may not "impose any effective technological measures" that restrict recipients from exercising their rights under the license
Open file formats Distributors of more than 100 copies must, at minimum, include a URI where a machine-readable copy of the work's text and other media is available in a widely used format whose specification is publicly known. Such URI should remain available for at least a year after distribution of the last copy in a format that is not machine-readable. No requirement for providing machine-readable copies nor for open file formats
Other license features Allows for cover texts and invariant sections
ช่วงเวลา
Perpetual
Warranty disclaimers
Disclaimers must be preserved
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รุ่นในอนาคต Authors may allow the license in the work to extend to all future versions of the license. (Allowing all future versions is required for text, but not images, on Wikimedia projects.) Authors may allow the license in the work to extend to all future versions of the license. Authors must allow derivative versions to be created under future versions of the license.