This blog post claims in passing that
SQLite is illegal, at least in Germany, but potentially worldwide
This is tacked onto another mostly-unrelated claim that GitHub's terms of service are incompatible with the GPL, which we have previously discussed. This unrelated claim appears overblown to me, so I am ignoring it except to note that the author may not be a reliable source of information on open source and the law.
When I Googled "SQLite is illegal in Germany", I found this question, which does seem to assert that SQLite's public domain status may be in doubt in some countries including Germany. Hwaci apparently sells licenses (at $6,000 USD a pop!) to users in such countries, but their CLA does not appear to include any copyright assignment (it purports to dissolve copyright entirely). As a result, it's not clear to me that they actually own the copyrights they are supposedly licensing. But it might not matter, because these licenses include a warranty of title, so if Hwaci is licensing code they don't own, that's their problem.
Can SQLite be fairly described as "illegal in Germany?"