CC BY-SA 4.0 now one-way compatible with GPLv3

The Creative Commons has announced that a"detailedanalysis" has determined that materials licensed under BY-SA 4.0license may be distributed under the terms of GPLv3. "But if youruse case calls for or requires (in the case of remixing CC BY-SA 4.0 andGPLv3 material to make a single adaptation) releasing a CC BY-SA 4.0adaptation under GPLv3, now you can: copyright in the guise of incompatiblecopyleft licenses is no longer a barrier to growing the part of the commonsyou're working in. We hope that this new compatibility not only removes abarrier, but helps inspire new and creative combinations of software andculture, design, education, and science, and the adoption of software bestpractices such as source control (e.g., through "git") in thesefields."