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> GPL means that anyone who modifies the source code, or integrates it into a larger work, has to release the modified version.

Is this accurate? I thought GPL only required distributing the source alongside binaries. If you're running GPL code as a web service, I don't think there's a requirement to release the source to your users.

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In this case, you would want the Affero General Public License (AGPL) which specifically has a carve-out (in?) for web servers. Section 13, "Remote Network Interaction; Use with the GNU General Public License." [0]

[0] "[...] your modified version must prominently offer all users interacting with it remotely through a computer network (...) an opportunity to receive the Corresponding Source of your version"

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