With the advancement of 4K broadcasting technologies from BS4K channel of NHK, CS4K channel of SKY PerfecTV and others alike, 4K recording devices are also getting popular among consumers, as they can record 4K Blu-rays from those broadcasting stations at home.
However, those recorded 4K Blu-ray discs come out also heavily encrypted, which means, users cannot handle those 4K BDAV discs the way they want. But with Passkey for 4K Recorder, which can decrypt all the recorded 4K discs, this is no longer a problem.

Unlike the commercial 4K Ultra HD Blu-ray discs which have a standard specification to comply with, the specifications of the recorded 4K Blu-ray discs may vary slightly from one recording device to another.
However, no matter what recording devices you use, which manufacturer made it, and what specifications it gives, such as the m2ts format from Sharp devices, or mmts format from Panasonic devices, Passkey for 4K Recorder has them all covered.

Besides the basic decryption feature, Passkey for 4K Recorder also offers users the primary 4K BDAV backup function to make full disc copy to the unprotected recorded 4K Blu-rays, and then save the output to computer HDD as 4K ISO image files, or 4K BDAV folders.