One of the 12 was "Power Series" aka fully allowing six full splatbooks in one stroke. Of the eight with more or less restrictions one of them was Dragon Magazine whose only restriction was "except the Unearthed Arcana column". Four others were non-player books (Open Grave, Manaual of the Planes and even two Monster Manuals), which only have a few choice bits allowed. You could call those as either the only samples of heavy restrictions or call those outstanding for even being considered at all.On the last copy I had of the LFRPG there are 20 items on that table....12 say ALL.....8 show some kind of restriction. And there is a small list of further restrictions right under the table as well.
Another "restricted" book was the Neverwinter Setting book, of which only "everything in chapter 2" was allowed. However looking into the Neverwinter Setting book, chapter 2 was actually the entirety of character mechanics it contained and in the non-allowed chapters there was nothing but fluff. So there wasn't really anything that was forbidden by adding the "everything in chapter 2" clause since the rest of the boom didn't have anything a player could have taken.
12/20 -> allowed fully (on of them being six books allowed in one stroke)
2/20 -> essentially allowed fully (Dragon in except unearthed arcana out and a restriction on the NW guide that actually restricted nothing at all)
2/20 -> mildly restricted (Eberron and Dark Sun Campaign guides both had some setting specific parts not allowed)
4/20 -> heavily restricted (non-player books only)
Conclusion: Basically every content aimed at players ever released in 4e was fully allowed in LFR, the majority of content aimed at players and DMs equally was allowed in LFR and even some tibits from content only aimed at DMs was allowed for players in LFR