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Go to IEEE or Wikipedia for details

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Posted by waqqas1

For explanation dear see the link below

http://encyclopedia2.thefreedictionary.com/Unlicensed+spectrum

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Posted by Hash007

Unlicensed or license-free spectrum as it is sometimes called simply means a spectrum band that has rules pre-defined for both the hardware and deployment methods of the radio in such a manner that interference is mitigated by the technical rules defined for the bands rather than it being restricted for use by only one entity through a spectrum licensing approach.
Or we can say that Open spectrum (also known as free spectrum) is a movement to get the Federal Communications Commission to provide more unlicensed spectrum, radio frequency spectrum that is available for use by all.

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Posted by sagitraz