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I suggest you visit the Adobe site for your particular sales region, as well as your particular customer kind (single user, small commercial, etc.) to make sure you get correct info.

My local site seems not to license ID alone, but some form of Creative Cloud, which, in some configurations, includes ID. I don't seem to find any 'smaller' license that ID + Adobe Express + Adobe Firefly (and including the Adobe Fonts library and some other 'free' stuff). And yes, Creative Cloud seem to be licensed by month.