GNU GPL

GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 ในส่วน Preamble (บทนำ) มีข้อความว่า

Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish)

และใน FAQ เขียนว่า

Does the GPL allow me to sell copies of the program for money? (#DoesTheGPLAllowMoney)

Yes, the GPL allows everyone to do this. The right to sell copies is part of the definition of free software. Except in one special situation, there is no limit on what price you can charge. (The one exception is the required written offer to provide source code that must accompany binary-only release.)

Does the GPL allow me to charge a fee for downloading the program from my site?

Yes. You can charge any fee you wish for distributing a copy of the program. If you distribute binaries by download, you must provide “equivalent access” to download the source—therefore, the fee to download source may not be greater than the fee to download the binary.

ฟรีซอฟท์แวร์ไม่ได้ห้ามโปรแกรมเมอร์คิดเงิน คำว่าฟรีคือฟรีดอมหรือเสรีภาพในการแจกจ่ายโค้ด

If I distribute GPL’d software for a fee, am I required to also make it available to the public without a charge? (#DoesTheGPLRequireAvailabilityToPublic)

No. However, if someone pays your fee and gets a copy, the GPL gives them the freedom to release it to the public, with or without a fee. For example, someone could pay your fee, and then put her copy on a web site for the general public.

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