lat9:
I've got a plugin under development that I'd like to release to the community, but there might be a glitch. The code's all mine, but the plugin operation requires the import of a separately-downloadable .csv (and associated database structure) that is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
Is this going to be an issue for submission to the Plugins?
That's a question a moderator can answer, but as I see it you may have a problem here. See http://www.zen-cart.com/content.php?53-rules-for-plugin-contribution-submission
Addon/Contribution Requirements
Contributed Addons which are hosted in the Zen Cart® "downloads" area must comply with the following standards:
License: Must be GPL, since it's integrating into Zen Cart® core code, which is GPL. A complete copy of the license should be included in the contribution files, preferably as a separate file. If an addon is free-standing (ie: doesn't use any existing Zen Cart® files in order to operate) then it can be licensed under another license provided that license is fully compatible with GPL.
Cheers / Frank