Released by developer "TheFloW," NoNpDrm is a plugin that bypasses the Vita's DRM checks. It allows the system to run games without official licenses.
The plugin works by reading "fake" license files. The zRIF string provides the necessary data to generate this fake license. Users typically input the zRIF string into an application (like PKGj or PKGi), which generates the license file on the fly and places it in the correct directory structure (ux0:license/...).
Technically speaking, a zRIF is a base64 encoded representation of a license file. In the official PlayStation Vita ecosystem, every game or application you download from PSN comes with a license (a work.bin file) that tells your Vita, "Yes, this user is allowed to launch this specific title."
When you dump a game cartridge (a .vpk) or download a backup, you have the data but not the permission. The zRIF string is that permission slip, compressed into a portable text format. ps vita zrif key
Think of it like this:
If you try to install a decrypted .vpk without a corresponding license, your Vita will do one of two things: Released by developer "TheFloW," NoNpDrm is a plugin
The Vita’s security is robust (well, as robust as a 2011 handheld can be). Without the zRIF, the operating system doesn’t recognize the software as legitimate.
On an original PS Vita with official firmware, the Sony kernel reads the work.bin to decrypt the executable. When the hacking scene reverse-engineered this process, they realized that all the necessary decryption data could be compressed into a short, portable ASCII string. That string is the ZRIF key. The Vita’s security is robust (well, as robust
The name "ZRIF" likely stems from "Zlib compressed RIF" (Rights Information File). It uses zlib compression to shrink a relatively large XML/JSON structure of keys and rights into a tiny string that can be shared on forums or pasted into a command line.
The existence of the zRIF methodology highlights both the strengths and eventual vulnerabilities of Sony's security model.