So, I have a quick question regarding how the additional materials rules work in terms of pdf/material ownership. When I play online games with my group of friends (non-PFS), we typically tend to own a single physical or PDF copy, and look at the PRD/Nethys during character generation. We play with each other fairly extensively and play together, so if one of us needed to look something up from a PDF, it is a fairly simple matter for the owner of the PDF to look up the relevant details in a book.
However, I am not entirely clear how the sharing rules work in the following situation:
1. Player A owns Pathfinder books containing non-Core materials.
2. Player B works with Player A to create a character using non-Core content, with the understanding that they would play with Player A.
3. At the table, Player A and Player B play together. Player A owns the non-Core material and can present it as necessary for Player B, similar to printing up specific pages for Player B's specific use cases.
Is this valid for PFS Play in general (physically, at a store/convention/etc)? Is this valid for PFS Play Online, where it would have to be documented with screenshots?