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Essential means that the patent is necessarily used when implementing a standard in a product or that there is no reasonably viable alternative for implementing the standard. In order to comply with anti-trust regulations in major countries only essential patents are to be included in the patent pool. Essential patents cover both technically essential patents and commercially essential patents.
source from:
http://www.one-blue.com/patent-coverage/
source from:
http://www.one-blue.com/patent-coverage/
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