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发表于 2014-6-15 23:55:33
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lz提到的FreeRTOS确实是免费，采用修改的GPL授权。虽然作者保留版权，但已授权他人可以修改而不需公开源代码。
只是免费的东东不会提供技术支持，用户也可以购买技术支持或技术文档。
GPL是有争议的东西，所以FreeRTOS作者特地强调使用者不需要公开修改后的代码。
FreeRTOS的版权声明：
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation and modified by the FreeRTOS exception.
**NOTE** The exception to the GPL is included to allow you to distribute a
combined work that includes FreeRTOS without being obliged to provide the
source code for proprietary components outside of the FreeRTOS kernel.
Alternative commercial license and support terms are also available upon
request. See the licensing section of http://www.FreeRTOS.org for full
license details.
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
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