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What are the best 'copyleft' open-source licenses?

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GPLv3 vs AGPL (Affero General Public License) vs LGPL (GNU Lesser General Public License)

 vs MPL (Mozilla Public License) vs EUPL (European Union Public Licence)

Pros + Cons

Pro
 Protects the author

The author of the software avoids any risk for how the software may be used by others.
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Pro
 Ensures source access

Designed to make sure users have the freedom to access source code.
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Pro
 Ensures that derivitave works are also protected by strong copyleft

Works extending the original must be licensed in a similar fashion to the AGPL, preserving and extending the user freedoms originally granted.
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Pro
 Protects user freedom in the cloud

Designed to ensure that end-users can access source code, even when applications run on remote web servers.
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Con
 Cannot be sublicensed

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