“Play in Sandbox” is a Fan Fic (Fan Fiction) term that means writing in someone else’s story world (their World is your Sand Box). Fan Fic is writing about or in stuff you don’t have a license for (characters, settings, background, story ideas).
A librarian on the panel got into Fan Fiction because the children using her library were into it.
Pro Fan Fic, (making money off other people stories?)
Kindle has a list of stuff that can be licensed. It’s a small list. If you buy a license is it Fan Fic, there are commercial authors writing in other peoples worlds (the 1632 series or in story worlds where the founding author has passed away and the current author is allowed to write in that story world).
It’s Cosplay if it’s not for pay.
AO3 is a site where you can download Fan Fic. Carries better written Fan Fic.
Mary Sue. The term came up again along with her left cousins Gary Stu and Marty Stu. You can have other characters in Fan Fiction without it being a Mary Sue.
The panel recommended taking a look at the story “How to Wreck a Mary Sue Character”.
Write on, draw on. Professor Hyram Voltage.