Linux & Open Source Header Solaris and Linux: No Code Swapping

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While Sun Microsystems is open to licensing Solaris under Version 3.0 of the GNU General Public License, it will not reconsider its decision not to license the operating system under GPL 2.0, the current version of the license.

Sun created the CDDL (Community Development and Distribution License) for Solaris after rejecting GPL 2.0 as too restrictive for its purposes.

Link: eWeek