Third Party Libraries

Library	Version	Description	GPL-Compatible?	Covered under FLOSS exception?
Apache Portable Runtime	1.2.8	A set of C functions which provide a portable and consistent interface into operating system - or simply widely useful - functionality. We primarily use it for threading and socket i/o. This is actually three packages, apr, apr-util and apr-iconv.	No, Apache 2.0 license	Yes
Boost	1.32.0	A set of portable C++ libraries which provide a wide set of functionality. Used primarily for tokenization.	Yes, BSDish
c-ares	1.3.2	Performs DNS requests and name resolves asynchronously. Used with libcurl to keep all HTTP operations async.	Yes, BSDish
CG	??	cg controls some visual effects. - NOT USED BY THE NORMAL CLIENT.	No, permissive license but forbids reverse engineering.	No
ELFIO	1.0.3	Enhanced stacktrace information on the Linux client.	Yes, LGPL
Expat	1.95.8	XML parser.	Yes, MIT
FMOD	3.75	Audio engine and mp3 stream decoder	No, proprietary	No
FreeType	2.1.5	Font engine.	Yes, dual licensed BSD/Advertising + GPL
Glib	2.0.7	??	Yes, LGPL
GTK+	2.0.9	'Native' UI components on the Linux client.	Yes, LGPL
jpeglib	6b	JPEG decoder library.	Yes, BSD
KDU	5.2.1	Kakadu (KDU) JPEG-2000 decoder library.	No, Proprietary
libcurl	7.16.0	Handles moving data across the net in many different protocols. Used to GET/POST/PUT/DELETE web resources.	Yes, MIT
libpng	1.2.18	PNG image library.	BSD-like
libuuid	??	Generates UUIDs under Linux. Originally a part of the ext2fs filesystem. Also see lluuid.cpp for all platforms.	Yes, LGPL
llMozLib	1.8.0.9	llMozLib handles rendering HTML in the viewer via an embedded Gecko (Mozilla) engine.	Yes, MPL/GPL/LGPL Tri-license
Mesa	6.2.1	Provides the required OpenGL headers under Linux.	Yes
OGG	1.0.3	Audio control.	Yes, BSDish
OpenGL	GLX	3D Graphics rendering engine.	No (see XFree86 License FAQ)
OpenJPEG	1.0	An open-source JPEG-2000 library; a slower alternative to Kadaku. Used in the open source release	Yes, however one must beware of patents.
OpenSSL	0.9.7c	Provides encryption for sensitive actions such as user login	No, advertising clauses.	Yes
Quicktime	7.13	Used to play in-world video clips on a prim.	No, Proprietary	No
libresolv / libllresolv	9.4.1	Linux only - libllresolv is simply a rebuild of the system libresolv.so as the latter is very often broken in various ways on Linux. Building libllresolv.	Yes, BSD
SDL	1.2.7	The Simple DirectMedia Layer libraries are used for handling input and basic window/GL setup on the Linux client.	Yes
Smartheap	??	Memory allocation (Windows only malloc() replacement)	No, Proprietary, but entirely optional (easy to comment out)	No
TUT	2006-06-22	Unit test framework based on the use of c++ meta template programming. Used to test LL libraries.	Yes, BSD
Vorbis	1.1.2	Audio control.	Yes
xmlrpc-epi	0.51	Controls the XML-RPC protocol.	Yes, BSD
zlib	1.2.1	zlib is a lossless data-compression library which is used for a variety of network i/o and file compression.	Yes, MIT-like

Redistribution

Some files in the SL installation can't be freely redistributed. This means it's not possible to simply package and offer for download a modified viewer: some files must not be redistributed.

This page documents the licenses and redistribution requirements of various files used by the viewer.

Windows

These are the files that need to be shipped with the Windows version

Runtime

Microsoft components. It's not yet know whether they're redistributable.

• dbghelp.dll: Redistributable
• msvcp71.dll: C Runtime Library, redistributable
• msvcr71.dll: C Runtime Library, Redistributable

FMOD

FMOD sound library. Free for non-commercial projects. A commercial license will be needed for a commercial viewer.

From the README in the package:

The fmod.dll file may be redistributed without the authors prior permission, 
and must remain unmodified.  The use of dll 'static linking' tools that aim
to hide the fmod library are forbidden.

• fmod.dll: Redistributable, free for non-commercial projects

Mozilla

The Gecko engine is MPL/GPL/LGPL licensed, which makes it redistributable.

• app_settings/mozilla
• freebl3.dll
• gksvggdiplus.dll
• js3250.dll
• nspr4.dll
• nss3.dll
• nssckbi.dll
• plc4.dll,
• plds4.dll
• smime3.dll
• softokn3.dll
• ssl3.dll
• xpcom.dll
• xul.dll

Kakadu

JPEG2000 library. Not redistributable. OpenJPEG is an alternative library that is redistributable (does it work on Windows?)

• llkdu.dll

OpenSSL

SSL library. Redistributable.

• libeay32.dll
• ssleay32.dll

Vivox

Vivox is the component that provides the voice functionality. Redistribution status unknown.

• SLVoice.exe: Voice daemon
• SLVoiceAgent: Exact purpose unknown
• alut.dll
• ortp.dll
• srtp.dll
• vivoxsdk.dll: Vivox Communications API
• wrap_oal.dll: OpenAL32 by Creative Labs

Unknown Libraries

The purpose and licensing of these files is not known:

• tntk.dll: Probably Vivox