我正在用Python开发一款软件,它将分发给我雇主的客户。我的雇主想用一个有时间限制的许可证文件来限制软件的使用。

如果我们分发.py文件甚至.pyc文件,将很容易(反编译和)删除检查许可证文件的代码。

另一个方面是,我的雇主不希望我们的客户读到代码,担心代码可能被窃取,或者至少是“新颖的想法”。

有什么好办法来解决这个问题吗?


当前回答

“有没有解决这个问题的好办法?”不。没有什么可以防止逆向工程。甚至DVD机器上的固件也被逆向工程,AACS加密密钥被暴露。这还是不顾DMCA规定的刑事犯罪。

由于没有任何技术方法可以阻止客户阅读您的代码,所以您必须应用普通的商业方法。

Licenses. Contracts. Terms and Conditions. This still works even when people can read the code. Note that some of your Python-based components may require that you pay fees before you sell software using those components. Also, some open-source licenses prohibit you from concealing the source or origins of that component. Offer significant value. If your stuff is so good -- at a price that is hard to refuse -- there's no incentive to waste time and money reverse engineering anything. Reverse engineering is expensive. Make your product slightly less expensive. Offer upgrades and enhancements that make any reverse engineering a bad idea. When the next release breaks their reverse engineering, there's no point. This can be carried to absurd extremes, but you should offer new features that make the next release more valuable than reverse engineering. Offer customization at rates so attractive that they'd rather pay you to build and support the enhancements. Use a license key which expires. This is cruel, and will give you a bad reputation, but it certainly makes your software stop working. Offer it as a web service. SaaS involves no downloads to customers.

其他回答

另一种让代码更难被窃取的方法是使用jython,然后使用java混淆器。

这应该工作得很好,因为jythonc将python代码转换为java,然后将java编译为字节码。因此,如果混淆了类,就很难理解反编译后会发生什么,更不用说恢复实际的代码了。

jython的唯一问题是你不能使用用c编写的python模块。

Python是一种字节码编译的解释型语言,很难被锁定。即使您使用py2exe这样的exe-packager,可执行文件的布局也是众所周知的,Python字节码也很好理解。

通常在这种情况下,你必须做出权衡。保护代码到底有多重要?里面有真正的秘密吗(比如对称加密银行转账的密钥),还是你只是多疑了?选择能让你最快开发出最好产品的语言,并现实地看待你的新想法的价值。

如果您决定确实需要安全地执行许可检查,可以将其编写为一个小的C扩展,这样许可证检查代码就很难(但不是不可能!)进行反向工程,并将大部分代码留在Python中。

“有没有解决这个问题的好办法?”不。没有什么可以防止逆向工程。甚至DVD机器上的固件也被逆向工程,AACS加密密钥被暴露。这还是不顾DMCA规定的刑事犯罪。

由于没有任何技术方法可以阻止客户阅读您的代码,所以您必须应用普通的商业方法。

Licenses. Contracts. Terms and Conditions. This still works even when people can read the code. Note that some of your Python-based components may require that you pay fees before you sell software using those components. Also, some open-source licenses prohibit you from concealing the source or origins of that component. Offer significant value. If your stuff is so good -- at a price that is hard to refuse -- there's no incentive to waste time and money reverse engineering anything. Reverse engineering is expensive. Make your product slightly less expensive. Offer upgrades and enhancements that make any reverse engineering a bad idea. When the next release breaks their reverse engineering, there's no point. This can be carried to absurd extremes, but you should offer new features that make the next release more valuable than reverse engineering. Offer customization at rates so attractive that they'd rather pay you to build and support the enhancements. Use a license key which expires. This is cruel, and will give you a bad reputation, but it certainly makes your software stop working. Offer it as a web service. SaaS involves no downloads to customers.

我理解您希望客户使用python的强大功能,但又不想公开源代码。

以下是我的建议:

(a)以C或c++库的形式编写代码的关键部分,然后使用SIP或swig将C/ c++ api公开给Python名称空间。

(b)使用cython而不是Python

(c)在(a)和(b)中,应该可以将库作为带有Python接口的许可二进制文件分发。

我很惊讶,在任何回答中都没有看到“具体”。也许是因为它比问题更新?

它可能正是你所需要的。

它不会混淆代码,而是在加载时对代码进行加密和解密。

来自pypi页面:

保护python脚本工作流程 Your_script.py导入pyconcrete Pyconcrete将钩子导入模块 当你的脚本导入MODULE, pyconcrete导入钩子将尝试查找MODULE。先撒,再撒 解密模块。Pye via _pyconcrete。Pyd并执行解密的数据(如 .pyc内容) 加密和解密_pyconcrete.pyd中的密钥记录 (如DLL或SO)的秘密密钥将隐藏在二进制代码,不能 直接在HEX视图中看到它