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In the shop there you buy the licence, you just need to go to the icons on the tables in the building and interact with them.

Sounds like very good idea, will do that, thanks^^

Where did you find that text? Would need to look it up to say more about it.

Oh did you mean "Sign" in general like fox sign?

If so Sign is just short for Signature like the forms Signatures Moves The naming format is also a small reference on how spellcards in touhou are named.