Warning: It seems that this isn’t possible, because the provision (that only "the last license applied" has to be followed) was introduced with CC BY-SA 4.0, so CC BY-SA 3.0 doesn’t allow it. Please see Trevor’s answer.
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
Warning: It seems that this isn’t possible, because the provision (that only "the last license applied" has to be followed) was introduced with CC BY-SA 4.0, so CC BY-SA 3.0 doesn’t allow it. Please see Trevor’s answer.
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3? What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)
If you adapt1 content licensed under CC BY-SA 3.0, you can (additionally) license your contribution under GPLv3 (but not the other way around).
See creativecommons.org’s Compatible Licenses:
CC BY-SA 3.0 is compatible with CC BY-SA 4.0.
CC BY-SA 4.0 is compatible with GPLv3.
(1 See my question What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?)