Licensing

• PS3 licensing

• PS4 licensing

The Playstation Vita uses open source available material, for most of its system resources, listed below:

Notes for readers/editors:

Bold term (left) with generic/wiki link, followed by more specific link if possible.

Playstation Vita

• base64: is a utility to encode and decode base64 files.
• [blist:] web based relational data base?
• bzip2: is a free and open-source file compression program.
• cJSON: is an ultra-lightweight, portable, single-file, simple-as-can-be ANSI-C compliant JSON parser.
• [FreeBSD:]
• FreeType 2: is a software font engine.
• giflib: is a library for rendering and generating GIF image files.
• Jerasure version 1.2A: is a Library in C/C++ Facilitating Erasure Coding for Storage Applications.
• libjpeg: is a widely used free software library written in C which implements JPEG.
• libtiff: is a library for reading and writing Tagged Image File Format (abbreviated TIFF) files.
• libusrsctp:
• MD5: is a message-digest algorithm.
• NetBSD: is an open-source, Unix-like operating system.
• CELT (Opus): is a interactive audio codec.
• Protocol Buffers: are a method of serializing structured data.
• squish: is an open source DXT compression.
• strlcpy is a C string handling (which copies a string to a destination buffer)
• zlib: is a software library used for data compression, written by Jean-loup Gailly (compression) and Mark Adler (decompression).

Calender

• libical: is an Open Source (MPL/LGPL) implementation of the IETF's iCalendar Calendaring and Scheduling protocols.

Email

• ICU: is a mature, widely used set of C/C++ and Java libraries providing Unicode and Globalization support.

Internet Browser

• cairo: is a 2D graphics library used to provide a vector graphics-based.
• cURL: is a computer software project providing a library and command-line tool for transferring data using various protocols.
• [dtoa:]
• [expat:]
• FreeType 2: is a software font engine.
• ICU: is a mature, widely used set of C/C++ and Java libraries providing Unicode and Globalization support.
• libjpeg: is a widely used free software library written in C which implements JPEG.
• libpng: is the official Portable Network Graphics (PNG) reference library (originally called pnglib).
• libxml2: is a software library for parsing XML documents.
• [OpenSSL:]
• [PCRE:]
• pixman: is a low-level software library for pixel manipulation.
• Webkit (<=1.81 / 2.00)
• zlib: is a software library used for data compression, written by Jean-loup Gailly (compression) and Mark Adler (decompression).

Panoramic Camera

• OpenCV: is a library of programming functions mainly aimed at real-time computer vision.

PlayStation Mobile

• [libYAML:]
• Mono class libraries: are class libraries.
• Mono VM: is a free and open source project to create an Ecma standard-compliant, .NET Framework-compatible set of tools.

In compliance with the LGPL, the source code of the open source software
is made available to you. For request, please send e-mail to: 
[email protected] with “Mono LGPL Request” in the subject line.
In the body of the e-mail include your name and e-mail address.

Welcome Park

• [Boost:]
• FLANN: is a library for performing fast approximate nearest neighbor searches in high dimensional spaces.
• OpenCV: is a library of programming functions mainly aimed at real-time computer vision.

PlayStation Vita Applications

PlayStation Mobile Development Assistant

• giflib
• libjpeg
• libtiff
• libYAML
• Mono Class Libraries
• Mono Virtual Machine
• squish

Taken from official list:
http://www.scei.co.jp/psvita-license/index.html