Do I or my customer need a license to operate a wireless link?

For applications like amateur HAM radio the FCC requires that the end user have a license to operate the radio equipment. For the portions of the spectrum governed by Part 15 however, the end user does not need a license. Instead, the product manufacturer must have the equipment tested in an FCC authorized facility and receive certification and an FCC ID number for the transmitter and a Declaration of Conformity (DOC) for the receiver before the product can be legally sold in the US. In this sense, the equipment must get the license so that the end user does not need one.