[rmc]

Modify & Distribute: If someone wants to download a zip file of your repository, then you have give BitBucket the permission to modify the content (to produce the zip file) and distribute it (to send it to someone who wants it).

Use it: I'm not sure, maybe to do syntax highlighting, they need to use the source code with a syntax highlighting software.

[goblin89]

Does content modification in legal speak really have the same strict meaning as we tend to imply? I just checked Instagram's Terms for example, and they have no mention of modification—though they obviously do compress and resize submitted images.

This makes me wonder if altering a sequence of bytes (for example, after conversion to a different format) is really a ‘modification’ if it still represents the same work.