Licensing

The Playstation 3 Software - everything within Lv0, Hypervisor (Lv1), GameOS (Lv2), VSH (XMB) and most libs - include a wide amount of open source material.

PlayStation®3

1.  AVM+
2.  eCOS
3.  Expat
4.  Free BSD
5.  FreeType2
6.  Libjpeg
7.  Libtiff
8.  Libungif
9.  MD4 Message-Digest Algorithm of RSA Data Security, Inc.
10. MD5 Message-Digest Algorithm of RSA Data Security, Inc.
11. NetBSD
12. SEE
13. Info-ZIP

Internet Browser

1.  cairo
2.  dtoa
3.  expat
4.  FreeType2
5.  hash.c
6.  ICU
7.  libjpeg
8.  libpixman
9.  libxml2
10. list.c
11. PCRE
12. trio
13. Webkit

Taken from and can be found at the official list:
http://www.scei.co.jp/ps3-license/index.html