What is an "IP implementation"?
I've often seen FPGA designs referred to as Intellectual Property. Probable reason: an FPGA design often is the major part of a design, representing lots of working hours, and getting hold of the code may allow you to copy it.
A problem with many FPGAs is that the design is indeed easy to copy. Boot Flash connects through a serial connection to the FPGA, and copying the design is as easy as placing a data logger on the connection. Today some FPGAs have their boot Flash integrated.