GNU Affero General Public License. Strong license for applications designed to guarentee user freedoms to access, modify, and redistribute server-side code.
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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.
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.
Pro Ensures source access
Designed to make sure users have the freedom to access source code.
Pro Protects the author
The author of the software avoids any risk for how the software may be used by others.