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They do. In theory it’s all sawmill off cuts and felled trees that it turns out aren’t good enough to use for anything else. No doubt everything chopped down is replanted and managed, this is Germany, and the pollution is contained in one place, away from housing so it’s better than everyone having home fires, but in reality everyone still burns their own wood because it’s more or less free and they’ve done it for generations, so no DVDs necessary.
Our pals live in a village in Bavaria where lots of the houses are heated by a municipal wood-burning energy generator: https://www.naturwaerme-reit-im-winkl.de/