Question 1

What is the difference between proprietary, permissive and copyleft licences?

Accepted Answer

**What you are permitted to do with the software**, and — critically for the last of them — what you must do if you distribute your own version.

**Proprietary.** The copyright holder grants a limited licence to **use** the software under stated terms. Source code is generally not provided, modification is prohibited, redistribution is prohibited, and the licence may restrict how many people or machines may use it.

**Permissive open source** — MIT, BSD, Apache 2.0.

**What they allow:** use, modification, redistribution, and **incorporation into proprietary products**. You may take permissively licensed code, modify it, and ship it inside closed-source software you sell.

**What they require:** essentially only **attribution** — preserving the copyright notice and licence text. **Apache 2.0** additionally includes an express patent grant and termination provision, which is why it is frequently preferred for commercial use over the simpler MIT.

**Copyleft open source** — GPL, AGPL, LGPL, MPL.

**The defining requirement: reciprocity.** If you distribute a modified version or a work incorporating the code, you must release **your** source under the same licence. The freedoms are preserved for downstream recipients, which is the entire purpose.

**The gradations matter:**

**GPL** — strong copyleft. Distributing a derivative work triggers the obligation.

**LGPL** — weaker. Designed for libraries, allowing proprietary software to **link** to the library without the obligation extending to the whole program.

**AGPL** — closes the **network loophole**. Under GPL, running modified software as a web service is not distribution, so no source release is required. AGPL treats network interaction as triggering the obligation, which is why many companies prohibit AGPL software internally.

**MPL** — file-level copyleft, applying only to modified files.

**Why organisations care.** Using copyleft code incorrectly in a commercial product can require releasing proprietary source, and licence compliance auditing is a standard part of due diligence in acquisitions.

**Source-available licences** — such as BSL and SSPL — permit reading and modifying the source while restricting commercial use. **They are not open source** by the accepted definition, and describing them as such is contested.

Question 2

Does open source mean free?

Accepted Answer

Not necessarily, and the confusion comes from English using one word for two different things. The standard clarification is "free as in speech, not free as in beer". Open source means the source

Question 3

What does 'open weights' mean, and is it the same as open source?

Accepted Answer

No. Open weights means the trained model parameters are downloadable; open source, in its established meaning, requires considerably more — and the distinction is actively contested because a great

Question 4

What are the best open-source software options for web development?

Accepted Answer

The best open-source software for web development includes CMS, frameworks, version control systems, development environments, and database management systems, each serving unique purposes.

Question 5

What is DRM, and why does content you bought disappear?

Accepted Answer

Digital rights management is technology restricting how digital content can be used, copied and accessed. Its existence is why "buying" digital content frequently does not mean what the button says.

Question 6

What is vendor lock-in, and how do you avoid it?

Accepted Answer

A situation where the cost of leaving a supplier exceeds the benefit of doing so — not because a contract forbids it, but because migration is expensive, risky or technically impractical. It is

Question 7

What are the best web development tools for beginners?

Accepted Answer

Beginners can start with tools like Visual Studio Code, Git, Bootstrap, WordPress, and browser developer tools to enhance their web development skills effectively.

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