The Default License: GNU GPL

TightVNC is available under the terms of the GNU General Public License (usually referred to as GPL). This is the primary type of licensing, you do not have to pay for it or enter into any special agreement. Just download the software and use it for any legally allowed purposes, including commercial use. Also, you may redistribute verbatim copies of the software with no limitations (unless such distribution is restricted by local or international laws). You even may modify the software and distribute its modified copies, provided that all your modifications are GPL-licensed as well.

GPL Restrictions

While GPL is usually a good option for end users of the software, it may not be that good for commercial software developers. GPL does not allow you to link GPL-licensed components with your proprietary software (without publishing it under the GPL as well). Also, it does not allow you to modify the GPL code and make the changes proprietary. Thus, you cannot use GPL code in your non-GPL projects (unless the GPL code is properly separated).

Business-Friendly Licensing

To solve the described problems, we offer alternate business-friendly licensing options. If you wish to integrate TightVNC into your commercial software package and GPL is not an acceptable option, you should obtain a commercial license.

Currently, we sell commercial licenses for several products:

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TightVNC Server for Windows
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TightVNC Server for macOS
TightVNC Viewer for Windows
TightVNC Java Viewer
C#/.NET Viewer SDK
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Viewer for macOS
Mobile Viewers (iOS, Android)
Pure C Tight Decoder

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