Hi, it looks like they're telling you that each sound's license terms will be explained by the interface (GUI = Graphical User Interface) when you select that sound.

CC refers to Creative Commons, who provide ready-to-use license agreements. The ones marked "CC 3.0 with attribution" can be used as long as you provide attribution (credit) as described by the Creative Commons license version 3.0.

There's some more info here: https://creativecommons.org/licenses/by/3.0/

"Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use."

The sounds marked "Public Domain" can be used freely.

I've never used or installed SampleScience, but if you provide the full file names of what you're seeing in the ZIP file, I might be able to point you in the right direction. You may need to talk to SampleScience themselves though.

Thanks
Kent
PG Music