Which open-source license should I choose?

For maximum adoption, use MIT — it is permissive and simple. For requiring derivative works to stay open source, use GPL-3.0. For projects used as libraries with permissive requirements, Apache 2.0 provides patent protection. For everything including commercial SaaS, AGPL-3.0 covers network use. Choose based on how you want your code reused.

Do I need a privacy policy for my app?

Yes, if your app or website collects any personal data (including IP addresses, cookies, analytics, and email addresses), you need a privacy policy. GDPR requires it for EU users, CCPA for California residents, and Apple/Google app stores require it for all published apps. Even simple analytics like Google Analytics triggers this requirement.

What is the difference between a Terms of Service and an EULA?

Terms of Service (ToS) govern the use of a web service or website — they cover user behavior, account rules, and liability. An End User License Agreement (EULA) specifically licenses software to end users — it covers installation rights, copying restrictions, and warranty disclaimers. Web apps typically need ToS; downloadable software needs an EULA; some products need both.

Can I use code from Stack Overflow in my project?

Code posted on Stack Overflow is licensed under CC BY-SA 4.0, which requires attribution and that derivative works use the same license. For small snippets (a few lines of common patterns), this is generally not an issue. For substantial code blocks, you should attribute the source and be aware that CC BY-SA may conflict with your project's license.

Legal Guide for Developers: What Every Programmer Needs to Know

Most developers focus on writing code and building features, but legal issues can destroy a project faster than any bug. From choosing the wrong license to violating privacy laws, legal missteps carry real consequences including lawsuits, financial penalties, and forced project shutdowns. This guide covers the essential legal knowledge every developer — from indie hackers to startup founders — needs to protect their work and their users.

February 23, 2026 15 min read Legal

Open-Source Licenses Explained

Every open-source license defines what others can do with your code. Choosing the wrong license can accidentally give away commercial rights or create legal conflicts with dependencies.

License	Type	Commercial Use	Must Share Changes?	Patent Grant
MIT	Permissive	Yes	No	No
Apache 2.0	Permissive	Yes	No	Yes
BSD 3-Clause	Permissive	Yes	No	No
GPL-3.0	Copyleft	Yes	Yes (source code)	Yes
AGPL-3.0	Strong copyleft	Yes	Yes (including SaaS)	Yes
LGPL-3.0	Weak copyleft	Yes	Library changes only	Yes
Unlicense	Public domain	Yes	No	No

License Compatibility: GPL code cannot be mixed with MIT code in a way that distributes the combined work under MIT. Always check dependency licenses before integrating them into your project. Tools like license-checker and fossa automate this process.

Privacy Laws Every Developer Must Know

If your software touches user data — even just IP addresses or browser cookies — privacy laws apply to you.

GDPR (EU — General Data Protection Regulation)

Applies to any service accessible by EU residents, regardless of company location
Requires explicit consent before collecting personal data
Users have the right to access, correct, and delete their data
Data breach notification required within 72 hours
Fines up to 4% of global revenue or 20 million euros

Use the GDPR compliance checker to audit your website's compliance.

CCPA (California Consumer Privacy Act)

Applies to businesses handling data of California residents
Requires a "Do Not Sell My Personal Information" link
Users can request their data be deleted
Must disclose what data is collected and how it is used

Essential Legal Documents for Software Projects

Privacy Policy

Required by law in most jurisdictions if you collect any personal data. Must detail what data you collect, why, how you process it, who you share it with, and how users can control their data. Generate one using our privacy policy generator.

Terms of Service

Defines the rules users agree to when using your service. Covers acceptable use, account termination, liability limitations, dispute resolution, and intellectual property. Create one with the terms generator.

Cookie Policy

Required if your site uses cookies (including analytics, authentication, and advertising cookies). Must explain what cookies you use, their purpose, and how users can opt out. Generate one at cookie policy generator.

EULA (End User License Agreement)

Licenses your software to users and defines usage restrictions, warranty disclaimers, and liability limits. Essential for downloadable software and mobile apps. Create one with the EULA generator.

Copyright and DMCA for Developers

Your code is automatically copyrighted the moment you write it — registration is not required for protection but is required to sue for statutory damages in the US.

Code you write: You own the copyright unless your employment contract assigns it to your employer
Open-source code: Copyright belongs to the author; the license grants usage rights
DMCA takedowns: If someone copies your code without permission, file a DMCA takedown with the hosting platform
Fair use: Short code snippets for education, criticism, or commentary may qualify as fair use

Legal Document Generator Tools

Generate Legal Documents:

Privacy Policy Generator
Terms of Service Generator
Cookie Policy Generator
EULA Generator
Disclaimer Generator
Refund Policy Generator
GDPR Compliance Checker
Robots.txt Generator

Frequently Asked Questions

MIT for max adoption; GPL-3.0 to keep derivatives open; Apache 2.0 for patent protection; AGPL-3.0 for SaaS coverage. Choose based on how you want your code reused.

Yes, if you collect any data (including IPs, cookies, analytics). GDPR, CCPA, and app store policies all require privacy policies.

ToS governs web service usage (behavior, accounts, liability). EULA licenses downloadable software (installation rights, restrictions). Web apps need ToS; software needs EULA; some need both.

Stack Overflow code uses CC BY-SA 4.0, requiring attribution and same-license sharing. Small snippets are generally fine; substantial blocks need attribution and may conflict with your project's license.

Legal Tools

Privacy Policy
Terms of Service
EULA Generator
Cookie Policy
GDPR Checker