How is Eclipse licensed?
Any software you download from eclipse.org is governed by a similar user agreement. This document, contained in a file called notice.html in the eclipse install directory, describes the licenses and other legal information that applies to the software. Each Eclipse plug-in typically has additional legal information in a file called about.html.
You should always speak with a lawyer for complete interpretation of any license, but it is safe to say that in essence the CPL provides free, unrestricted access to the source code and other creative matter it covers. CPL-licensed code can be redistributed or sold without making royalty payments to the copyright holders. The fact that dozens of companies are shipping commercial Eclipse-based products is a strong indication that the CPL is widely regarded as a safe, liberal open source license.
CPL FAQ (http://ibm.com/developerworks/library/os-cplfaq.html)
CPL version 1.0 (http://www.opensource.org/licenses/cpl.php)
eclipse.org Legal FAQs (http://eclipse.org/legal)