How to perform code authorization and encryption protection?

In the current information age, there are a large number of software, programs and code files on the Internet. Many of them need to be protected to avoid piracy or malicious use. At the same time, some codes need to be authorized to obtain Economy Profit. So, the question arises: How to perform code authorization and encryption protection?

1. Code Authorization

Code authorization refers to granting the right to use, modify, or publish software or program source code under certain conditions. At this time, the program developer, as the copyright holder, needs to clarify under what circumstances others are allowed to use the code, in what manner, and what restrictions the other party has. The following common code licensing methods are:

1. Public domain licensing: that is, the program developer gives up all rights to the copyright of the program, allowing anyone to freely use, modify and distribute the program. The biggest advantage of this licensing method is that it is easy to obtain and use. The most famous public domain licensing agreement is the BSD agreement.
2. MIT license: The MIT license is a very loose open source software license that allows others to use, distribute and modify the source code freely and without restriction. But there is a condition of the MIT license, which is to include a copyright statement and a license statement in the source code and documentation.
3. GPL/RPL protocol authorization: GPL/RPL protocol is also a frequently used authorization method. It requires anyone to use, modify, and distribute source code or derivative works to open source code, and the code used must also follow the same authorization method, thus ensuring the freedom and openness of software code.
4. Commercial license: Commercial license requires payment, but also allows the licensor to restrict the use, modification, and distribution of software users. This authorization method can guarantee the economic rights and interests of program developers.

2. Code encryption protection

In fact, authorization is only the first step in source code protection, and code encryption protection is the real means to prevent source code leakage and theft. Code encryption methods can generally be divided into the following categories:

1. Algorithmic encryption: Algorithmic encryption uses mathematical calculations to encrypt codes, and is generally used to encrypt information or protect important algorithms. For ordinary software programs, algorithmic encryption is not commonly used because the threshold for decryption is very low. Once it is cracked, program security will be completely out of control.
2. Difference analysis: Differential analysis compares the original file with the encrypted file, and cracks the original code by counting the differences between the two files. The reliability of this method is not high and it is suitable for projects with low security requirements.
3. Multi-layer encryption: Multi-layer encryption can encrypt the code multiple times. Generally, it is combined with other encryption methods to make decryption very difficult. This is an optimization of several previous encryption methods.
4. Conditional compilation: Conditional compilation is a technology that compiles different versions of source code according to different conditions, and achieves code confusion in the process of generating different versions. The encryption of this method is relatively high, but the disadvantage is that it greatly increases the difficulty of maintenance.

It should be noted that the purpose of encryption is to ensure the security of the source code. In order to achieve this purpose, the encryption method cannot be absolutely safe. Once the encryption is cracked, all code security will be lost. Loss of guarantee, so we should standardize the design of the code structure while considering encryption, and adopt a high-cohesion, low-coupling design pattern to make the code highly robust and robust.

In general, code authorization and encryption protection are very important parts of the program development process. Authorization allows developers to better manage software copyrights, while encryption protection can protect the software to a certain extent. Security and Copyright. It is necessary to fully consider the design of the code structure during the development process, establish a robust and robust code structure, and adopt reasonable authorization methods and encryption methods to achieve the best code protection effect.

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