Hi folks. Quesiton about canon. The folks over at DMSGuild sell PDFs of old D&D books but they also publish their own straight-to-PDF adventures and expansions. It seems they have a licence from WOTC. I'm wondering how we treat these canon wise as they are expanding on WOTC books but are not directly from WOTC.
DM's Guild works like Elminster's Guide to Magic are not by WotC, not licensed by them to another company, but only use WotC's content with their permission. It feels like just another third-party publisher, or more likely an avenue for fan works. On a more practical basis, as fan works, they will inevitably contradict. So, I don't think they should be handled by the Forgotten Realms Wiki. These could be archived by a fanon wiki like the Candlekeep Wiki.
I guess we can consider canon (or pseudo-canon) those works under the [Guild Adept Program http://dnd.wizards.com/articles/news/guild-adept-program], as those products are written by people specifically chosen by WotC to write such stuff following specific guidelines (such as to be related with the current product/storyline WotC is publishing at the time). For the other stuff, I'm with BadCatMan: those stuff is fanon.