I plan to develop a free/open source CD/DVD mastering software in the future with the following features: 1. Burn all types of discs (data, audio, and video CD/DVD) 2. DVD authoring and Video editing / conversion. 3. Audio/Video Player (the included DVD decoder cannot be used with other video player) 4. Backup computer files. 5. ISO file creation. 6. disc copying (does not support the copyright-protected DVD.). I will not use the GPL license. Instead, I will create my own license and include the sentence "This software should only be used for legal purposes. If you try to do any illegal things with this software, including but not limited to copyrighted disc protection, the developers of this software will not be responsible.". And, the person who modify the source code must submit the compiled and non-compiled source code to the other developers to gain approval before they can upload it to any website. If any features are illegal, how to make it legal without remove it? I planned to develop this software in the future. I want to make sure that all the included features are legal. My actual questions are the following: Is there any features are illegal? And, if illegal, can I make it legal without removing it? If can, how to do it?