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I found this blurb in Ciana report (http://files.shareholder.com/downloads/ABEA-26H477/0x0xS950123-10-115852/936395/filing.pdf )
"in connection with the MEN Acquisition, we obtained a non-exclusive license to use patents and other intellectual property controlled or exclusively owned by Nortel in connection with our manufacture, sale and support of a broad range of optical networking and Carrier Ethernet products and services and natural evolutions of such products and services. This license also provides us with an exclusive license to use a narrower set of patents and other intellectual property owned by Nortel in connection with Ciena’s manufacture, sale and support of optical networking and Carrier Ethernet products and services within a narrower field of use and subject to certain limitations. As part of this license, we granted Nortel a non-exclusive license to use the patents and other intellectual property (except trademarks) that we acquired as part of the MEN Business in connection with the manufacture and sale of products and services in the fields of Nortel’s other businesses (including those businesses sold and to be sold to other parties) and natural evolutions of such"
I read elsewhere that Ciena acquired 1100 Nortel patents. The above seems to indicate that Ciena has the right to use Nortel's other patents.