The prolific Alan Levine wrote recently about licenses, and how really they’re not the be-all and end-all of sharing openly:
If we just focus on licenses and picking through the morsels of what it does and does not do, IMHO we lose sight of the bigger things about sharing our work and acknowledging the work of others as a form of gratitude, not compliance with rules.I absolutely agree. The problem is, though, that people don’t know the basics. For example, sometimes I choose to credit those who share images under a CC0 licenses, sometimes not. Either way, I don’t have to, and not everyone is aware of that.
Share for gratitude, not for rules and license terms.
Which is why I found this infographic (itself CC BY SA 3.0) on Creative Commons licenses particularly useful: