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That is very disconcerting. By now I really regret doing the "elegant" thing instead of just putting out a free and pro version seperately. But by now a good few people have bought the In-App pro version and I would have to work out how to get the Pro version to them if I ever change away from the current disaster of a license model -.-
You said the App complains about Google Play Services when it does not realize you bought the pro license - does it ALWAYS do that? In that case I at least have an idea how to work around that by caching some values on your device in case Google can't be bothered at that very important instant...
Regarding your second point I would have to verify it, but it should already be displayed in the book details along with other custom columns. I am somewhat reluctant to implement filtering by this kind of column because it could well contain a lot of data for some users and I would be left doing some very expensive dumb text matching. (In the regular search I convert all the comments in the normal comments field into a format optimized for full-text matching as search performance before I did that was abysmal).
If you could give me some pointers how people actually use this kind of column and what kind of matching/filtering you would expect I might be able to assess this with more accuracy.
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