Many Flavors of LicensesThe Classic LicensesIn the Beginning: The GPLFree, open, and CopyleftedThe “Lesser” GPLUsing the GPL in Your Own WorkThe BSD Licenses: FreeBSD, OpenBSD, and NetBSDThe MIT LicenseSecond-Generation/Single-Project LicensesThe Apache License 2.0The Artistic License (Perl)Corporate LicensesThe Netscape Public License (NPL) and Mozilla Public License (MPL)The Sun Industry Standards Source License (SISSL)The Apple Public Source License (APSL)The IBM/Eclipse Public License (EPL)The Lucent Public License (Plan 9)Other Corporate LicensesWhy Pick Just One? The Dual Licensing Option