Bonum Certa Men Certa

Why free software shouldn't depend on Mono or C# -- by Richard M. Stallman

Debian's decision to include Mono in the default installation, for the sake of Tomboy which is an application written in C#, leads the community in a risky direction. It is dangerous to depend on C#, so we need to discourage its use.



“We should systematically arrange to depend on the free C# implementations as little as possible.”The problem is not unique to Mono; any free implementation of C# would raise the same issue. The danger is that Microsoft is probably planning to force all free C# implementations underground some day using software patents. (See http://swpat.org and http://progfree.org.) This is a serious danger, and only fools would ignore it until the day it actually happens. We need to take precautions now to protect ourselves from this future danger.

This is not to say that implementing C# is a bad thing. Free C# implementations permit users to run their C# programs on free platforms, which is good. (The GNU Project has an implementation of C# also, called Portable.NET.) Ideally we want to provide free implementations for all languages that programmers have used.

The problem is not in the C# implementations, but rather in Tomboy and other applications written in C#. If we lose the use of C#, we will lose them too. That doesn't make them unethical, but it means that writing them and using them is taking a gratuitous risk.

We should systematically arrange to depend on the free C# implementations as little as possible. In other words, we should discourage people from writing programs in C#. Therefore, we should not include C# implementations in the default installation of GNU/Linux distributions, and we should distribute and recommend non-C# applications rather than comparable C# applications whenever possible. ⬆

Comments

Recent Techrights' Posts

Links 09/10/2026: Stranded Busan Shark Still a 'Circus', Endangered Monkey Rescued, BBC Shells Out Money
Links for the day
The Register MS Sponsored to Hype Up "Datacenters" and "AI" (Bubble, Pyramid Scheme)
"Sponsored by Cisco" with "AI" 26 times in this page
World Mental Health Day is Tomorrow and EPO Staff Talks About What the Job Does to Workers
In recent years we've written a great deal about mental health consideration in relation to work, with a focus on "IT"
You Definitely Do NOT Wish to Live Close to a Datacentre
put aside for a moment the noise, the pollution...
GGG Pot Calls the Kettle Black
"It means a situation in which somebody accuses someone else of a fault which the accuser shares, and therefore is an example of psychological projection, or hypocrisy. Use of the expression to discredit or deflect a claim of wrongdoing by attacking the originator of the claim for their own similar behaviour (rather than acknowledging the guilt of both) is the tu quoque logical fallacy."
 
Production Freeze at the European Patent Office (Opposing Monarchy, Institutional Maladministration and Corruption)
Eight reasons to participate
Links 10/10/2026: Microsoft 'Open' 'AI' Silencing Critics, "Data Centres are the New Front Line in the Russia-Ukraine War"
Links for the day
Over at Tux Machines...
GNU/Linux news for the past day
IRC Proceedings: Friday, October 09, 2026
IRC logs for Friday, October 09, 2026
Gemini Links 10/10/2026: Optimism, Stargazing, "Life Without Smartphone", and Fairphone 4
Links for the day
Gemini Links 09/10/2026: Manifesto, Slop, Geminispace, and "Cryptography of the Internet"
Links for the day
Betanews is Still a Slopfarm, Articles About "Linux" Are Fake and Plagiarism by LLMs
Cheaters and plagiarists aren't journalists; they're people who rip off and harm journalists
James Bottomley Has Promoted Microsoft-Controlled Restricted ('Secure') Boot, His Blog Has Just Been Cracked
Does this meet IBM's and Microsoft's standards for "distinguished" (in security)?
Links 09/10/2026: "Internet Archive to Demo Wayback Machine at Friday’s Uniqlo Street Festival", France Wages Censorship War via DNS
Links for the day
Controlled Opposition
The underlying concept is hardly new
More Stallmans
We need more Stallmans, we don't need to change Stallman
SUEPO Munich (EPO Staff Union in the Main Headquarters) Opposes Monarchy ('Cocaine King' Campinos), Plans Online Meeting Next Week
They may have about 1,000 workers joining in
GNU/Linux Flirts With 20% "Market Share" in North America Overnight
Who should we trust on GNU/Linux? Microsofters on an armchair or Cloudflare Radar?
New Site Makes the Case Against Adoption of Omarchy, But Focuses Almost Entirely on Politics
Let's examine what the page says and what points it focuses on
Brigading Against Women - Part XXIV - Nobody's Name is Unspeakable
Names are not sacred
Microsoft is in Trouble (With the Regime It Sponsored)
It seems like Microsoft paying the existing regime/dictatorship wasn't enough
In the United Kingdom, Rising Cost of Hardware Benefits GNU/Linux
GNU/Linux rose from about 4% to almost 6% in one year
Japanese Targets of Cyber Breaches or Insider Threats
Japanese government bureau and major firms experience data breaches
Gemini Links 09/10/2026: Optimism, Stargazing, and Solar MiniServer
Links for the day
The Microsoft Ban Should Go Further (Telecommunications Cybersecurity and Resilience Act Incompatible With Back Doors)
it's not difficult to see where to start
When Americans Export a 'Suicide Mission' to Other Continents
I worry that this culture of debt-taking and overconsumption is being spread from the US to Europe
The Register MS: "AI" Several Times in Same Headline, 31 Times in Page. The Register MS Was Paid to Do This.
The phenomenon is commercial (paid media), not scientific
The Outcome of Microsoft Ban Was Predictable
told you so
Over at Tux Machines...
GNU/Linux news for the past day
IRC Proceedings: Thursday, October 08, 2026
IRC logs for Thursday, October 08, 2026
Gemini Links 08/10/2026: Economical Thrashing, How I Killed the Earth, and Thoughts on Gemini
Links for the day
Links 08/10/2026: Wikimedia Bemoans Chaffbot Slop (Bots Sold as 'Agents') That Sabotage It, ICC's Taliban Warrants
Links for the day
Links 08/10/2026: Slop Scammers (Pushers) Inflate Hosting Bills and "YouTube Testing Everything"
Links for the day
The Register MS Helps Prove the "AI" Frenzy in the Media is Evidence of Compromised Media, Not Legitimate "Revolution"
Ignore the hype and carry on
London Became Synonymous With the Royal Courts of Justice
London used to be a place where we go on holiday/retreat/break; nowadays we have only one destination there
Microsoft Insiders on "Effectively Being Silently Laid Off From Microsoft"
People are laid off by the thousands without the media uttering a word or the companies confirming anything
Brigading Against Women - Part XXIII - Extremism in the Mix and Getting the Police Involved
In 2012 I was getting heckled a lot for opposing back doors in Linux; it has not stopped since
Over at Tux Machines...
GNU/Linux news for the past day
IRC Proceedings: Wednesday, October 07, 2026
IRC logs for Wednesday, October 07, 2026