Postby ESP_Yuhao » Mon Jul 10, 2017 3:54 am
Hi Possan,
There is no licensing fee involved in Espressif product. Espressif don't charge any licensing fee from our users.
And yes, we are aware of some of the patents held by some companies, who sent out letters to customers requesting patent royalties.
Here are the facts about these companies:
1. Their licensing programs only cover finished products but NOT chipsets. They do not license patents to chip manufacturers.
2. In other words, Espressif cannot license from these patents. Neither do other chip manufacturers.