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>Sure it does. Code by default is usable by anyone. A registry of copywritten code would appear which we could easily cross-reference.

Having an easily accessible registry of copyrighted code would make it easy to "patent troll" any open source projects.

The reverse is also true, but open source projects have much less money to dedicate to legal battles.

No, this isn't true at all. Because everything is presumably under copyright already we already have such a database. It's simply "everything"

The difference here is that the vast majority of works would suddenly be free from this system and unavailable for any type of IP litigation.

What's easier to search: the entire internet, or a database of copyrighted code tagged with the owner of said code?