In the legal note, we highlight some of the most important differences for Wikimedia, including new official translations, increased readability, a revised description of the attribution requirement, an opportunity to correct license violations, and more. Creative Commons has also published a comparison of the changes in the license.
CC BY-SA 3.0 did not have official translations of the unported license text, although it had translated license deeds and a number of international ports. The ported versions of CC BY-SA 3.0 were substantially similar to each other, but included some legal modifications to reflect the local jurisdiction. Creative Commons' new license translation policy will allow them to set official translations of the version 4.0 license. CC BY-SA 4.0 International is intended to be legally effective everywhere.
這將會怎樣影響中文維基新聞及其他現時不是使用CC BY-SA 3.0的維基計劃？
中文維基新聞可能將升級到CC BY 4.0國際版，而跳過3.0版授權條款。如有需要，計劃可以繼續指定預設條款。
CC BY-SA 4.0 International includes new requirements for database rights, in jurisdictions where those rights exist. To avoid introducing new ambiguity around the requirements for factual contributions of data sets, which may be covered by database rights in certain jurisdictions, we've proposed waiving these rights under the license. This is outlined in more detail in the legal note.
The sharealike clause in the CC BY-SA license helps promote the values of free culture. It asks users to continue to share their improvements and modifications to works that are offered to them freely under the Creative Commons license.
If the license were just CC BY (without a sharealike clause), people would be able to use content from the Wikimedia projects for any purpose, but if they made changes, they could put those changes under additional copyright restrictions and forbid others to use them. The ideal is to make the world's knowledge available for everyone, and using a license that makes sure contributions to that knowledge remain available for everyone helps work toward that goal.
When deciding which license to use, the Wikimedia community for the most part chose CC BY-SA instead of BY because the CC BY-SA license helps promote the values of free culture, as described in Creative Commons's statement of intent for the attribution-sharealike licenses. For historical reasons, the CC BY-SA license was also chosen for its compatibility with Wikipedia's previous GNU Free Document License. Some other projects, such as English Wikinews, choose to use the use the CC BY license.