** Question about the CC-BY (Creative Commons - Attribution) License **

Can anybody help answer these questions?

1. Person 1 creates something and offers it under CC-BY.

- This means it's free for anyone to use as long as Person 1 is given credit for having created it.

2. Person 2 creates something using what Person 1 created, and also releases what he created under the CC-BY license.

- This is OK, as long as he gives credit to Person 1.

3. Person 3 creates something based on what Person 2 created.

- This is OK, as long as he gives credit to Person 2.

QUESTION 1:
Does Person 3 need to give credit to Person 1, or is it enough to only give credit to Person 2?



Here are 2 concrete examples of the question as it relates to the Tatoeba Project.


** Example 1

Someone (Person 1) creates something using the Tatoeba Corpus.

Someone else (Person 2) creates something based on the Corpus and releases it under the CC-BY license.

Yet another person (Person 3) creates something else based on what Person 2 created.

QUESTION 2:
Does it violate the Tatoeba Project's CC-BY license if Person 3 doesn't attribute the Tatoeba Project?


** Example 2

Someone (Person 1) creates something and offers it under the CC-BY license.

Someone else (Person 2) copies sentences from that source and adds them to the Tatoeba Corpus, and attributes the source in a comment on each sentence's page, clearly stating that the sentence is being used under the CC-BY license.

Yet another person (Person 3) uses sentences from the Tatoeba Corpus for a project, but doesn't attribute Person 1.

QUESTION 3:
Does this mean that Person 3 has violated Person 1's CC-BY license?