Hello Kamil,
No you do not need to pay license ofr the use of the SDHC nevertheless if you are going to sell the product with an SD, then I think you need to sign an agreement with the SD Association I believe it is the SD Memory Card License Agreement ("CLA").
Have a great day,
Jaime
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------