The software is distributed as Free To Use But Restricted. Free trial version never expires, the limitations are

  • The trial version could not obfuscate the big scripts.
  • The scripts obfuscated by trial version are not private. It means anyone could generate the license file for these obfuscated scripts.
  • The trial version could not download the latest dynamic library of extra platforms, the old versions still are available.
  • The super plus mode is not availaible in the trial version.
  • Without permission the trial version may not be used to obfuscate the Python scripts of any commercial product.

About the license file of obfuscated scripts, refer to The License File for Obfuscated Script

A license code is required to unlock all the above limitations.

There are 2 basic types of licenses issued for the software:

  • A personal license for home users. The user purchases one license to use the software on his own computer. When placing an order of this kind of license, please fill real name as registration name, this software is only authorized to this registration name.

    Home users may use their personal license to obfuscate all the python scripts which are property of the license owner, to generate private license files for the obfuscated scripts and distribute them and all the required files to any other machine or device.

    Home users could NOT obfuscate any python script which is NOT property of the license owner.

  • A enterprise license for business users. The user purchases one license to use the software for one product of an organization. When placing an order of this kind of license, please fill orginization name plus product name, this software is only authorized to this registration name.

    One product include the current version and any other latter versions of the same product.

    Business users may use their enterprise license on all computers and embedded devices to obfuscate all the python scripts of this product, to generate private license files for these obfuscated scripts and distribute them and all the required files to any other machine and device.

    Without permission of the software owner the license purchased for one product should not be used for other product. Business users should purchase new license for different product.

    In any case, the software is only used to obfuscate the Python scripts owned by the authorized person or enterprise.


To buy a license, please run command

pyarmor register –buy

Or open the following url in any web browser[300871197]=1

For personal license, please fill the registeration name with real name when placing an order.

For enterprise license, please fill the registeration name with enterprise name, and also fill “License To Product” with the product name which will use this software.

A registration file generally named “pyarmor-regcode-xxxx.txt” will be sent by email immediately after payment is completed successfully.

Save it to disk, then run the following command to register PyArmor

pyarmor register /path/to/pyarmor-regcode-xxxx.txt

Check the registration information:

pyarmor register

After registration successfully, remove all the obfuscated scripts by trial version, then obfuscate them again.


If the version of PyArmor < 6.5.2, please open the registration file “pyarmor-regcode-xxxx.txt” by any text editor, following the guide in it to register PyArmor


The registration code is valid forever, it can be used permanently, but it may not work with future versions, it may need to purchase new license if using a future version.

Upgrade Notes

The license purchased before 2019-10-10 don’t support to upgrade the latest version. If need use the latest version, purchasing a new license, and run pyarmor register command. If you have issued any license.lic generated by old license, and still want it works, run pyarmor register with option -u to register new license. For example,

pyarmor register -u /path/to/pyarmor-regcode-xxxx.txt

Technical Support

If there is any question, first check these questions and solutions, it may help you solve the problem quickly.

If there is no solution, for technical issue, click here to report an issue according to the issue template, for business and security issue send email to

Generally all the other issues sent by email will be ignored.

There are 3 kinds of issues:

  1. The limitation of obfuscated scripts, or called known issues.
  2. PyArmor defect.
  3. Wrong usage.

For the first catalog, it can’t be fixed. For example, use inspect to visit co_code of code object, use pdb to trace obfuscated scripts. All of these don’t work, they’re known issues. Here list all the known issues The Differences of Obfuscated Scripts.

For the second catalog, it’s my due to fix it.

For the rests, it’s your due to read the documentation and fix it. I’ll give you hints and maybe examples, but I will not hand by hand tell you which comand and options should be used to obfuscate your scripts.

Suppose you purchase Microsoft Excel, and want to make a complex chart. You must learn the advanced features of Excel, then make this chart by yourself. You can not ask Microsoft to make the complex chart for you.

Similarly pyarmor provides a lot of features and well document, but you need learn them by yourself. For example, the restrict mode is advanced feature of PyArmor, my due is to implement it as described in the document, you need learn this advanced feature and refine you code to adapt it. It’s not my due to read your scripts and adapt your scripts to restrict mode.

If you plan to obfuscate or use any third-party package, I also can’t obfuscate this package for you and make sure it’s compatible with pyarmor. Here is a list about all of The Differences of Obfuscated Scripts. If the package uses these features changed by obfuscated scripts, it will not work with pyarmor.

There are countless big packages in Python world, many packages I never use and even don’t know at all. It’s also not easy for me to research a complex package to find which line conflicts with pyarmor, and it’s difficult for me to run all of these complex packages in my local machine.

Generally in this case users provide the simple snapshot code around exception, or some running information, I analysis them to find where it may conflict with pyarmor and try to find the solution.

Q & A

  1. Single PyArmor license purchased can be used on various machines for obfuscation? or its valid only on one machine? Do we need to install license on single machine and distribute obfuscate code?

    It can be used on various machines, but one license only for one product.
  2. Single license can be used to obfuscate Python code that will run various platforms like windows, various Linux flavors?

    For all the features of current version, it’s yes. But in future versions,
    I’m not sure one license could be used in all of platforms supported by
  3. How long the purchased license is valid for? is it life long?

    It’s valid for ever. But I can’t promise it will work for all the future
    versions of PyArmor, it may need to purchase new license if using a future
  4. Can we use the single license to obfuscate various versions of Python package/modules?

    Yes, only if they’re belong to one product.
  5. Is there support provided in case of issues encountered?

    Report issue in github, refer to technical support section above.
  6. Does Pyarmor works on various Python versions?

    Most of features work on Python27, and Python30~Python310, a few features
    may only work for Python27, Python37 later.
  7. Are there plans to maintain PyArmor to support future released Python versions?

    Yes. The goal of PyArmor is let Python could be widely used in the
    commercial softwares.
  8. What is the mechanism in PyArmor to identify whether modules belong to same product? how it identifies product?

    PyArmor could not identify it by itself, but I can check the obfuscated
    scripts to find which registerred user distributes them. So I can find two
    products are distributed by one same license.
  9. If product undergoes revision ie. version changes, can same license be used or need new license?

    Same license is OK.
  10. What means a product serials under PyArmor EULA?

A product serial means a sale unit and its upgraded versions. For
example, pyarmor for personal, pyarmor for enterprise, pyarmor from
version 1.0 to 7.0, and pyarmor-webui, the grahpics user interface of
pyarmor, all of them belong to one product serial.