Pertama mengapa? Kecuali jika ada kemungkinan besar terjadinya hal ini (dalam hal ini, Anda harus menemui pengacara Anda sekarang , tampaknya Anda menderita I-am-afraid-someone-will-take-from-me
sindrom tersebut.
Dalam semua keseriusan, apa yang Anda khawatirkan, dan mengapa seseorang membeli kode Anda dari orang lain jika itu bebas dari Anda? Dan jika nilai tambah dari pihak ke-3 cukup untuk menjamin pembelian, mengapa Anda ingin menghentikannya? Dengan kata lain, itu akan menjadi hal yang baik untuk Anda (ekosistem yang lebih besar), bukan hal yang buruk.
Jawaban aktual di sini:
Saya sarankan Anda mengambil lisensi BSD berikut dan menambahkan poin ke-4 yang mengatakan sesuatu seperti ini.
* Redistribution of this software in source or binary forms shall be free
of all charges or fees to the recipient of this software.
Namun, saya bukan pengacara, jadi saya menyarankan Anda menjalankannya dengan baik.
Copyright (c) <year>, <copyright holder>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the <organization> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.