[nickpsecurity]

It replicates once it attaches to things. This is true even of distributing a large amount of non-free code while someone in organization unknowingly included a tiny amount of copyleft code. Now, FSF etc are usually more reasonable about enforcement and I doubt most would do more than ask it be removed if whole isn't GPL'd.

The image fits the behavior of the code, though. Hence the meme. More accurate description is like an agreement many parties participate in with copyright used to seal the deal for current and future distributions. So, control-freaks enforcing ideology on improvements to what they create rather than virus. ;)

[dragonwriter]

> It replicates once it attaches to things.

No, it doesn't.

> This is true even of distributing a large amount of non-free code while someone in organization unknowingly included a tiny amount of copyleft code.

If a single work is distributed that is based on copyleft code (not a mere aggregation that includes copyleft code and other code), then not licensing the resulting work as specified in the copyleft license is a violation of the license of the copyleft code. But the license doesn't attach on its own to the work.

[nickpsecurity]

Now, it's possible my memory is messing me up again or I bought into a false explanation of the legal issues.

To be clear, your saying that my worry was inaccurate and one person including GPL code into a new, released version of a proprietary app doesn't require the whole, linked source of that app be released under GPL? That happening is very virus-like but if it can't then it wouldn't be virus-like.

[dragonwriter]

> To be clear, your saying that my worry was inaccurate and one person including GPL code into a new, released version of a proprietary app doesn't require the whole, linked source of that app be released under GPL?

If the inclusion suffices to make the app as a whole a derivative work under copyright law (the FSF has a particular opinion on linking, but that opinion is not included in the license), then it would require you to offer the app under the GPL, failure to do so would be a violation of the GPL.

There is nothing "virus-like" here. The license doesn't attach without your knowledge. You may face consequences for the breach if you don't comply with the GPL terms, and releasing the whole work under the GPL may be the most convenient way of dealing with that -- then again, it may not.

[nickpsecurity]

"The license doesn't attach without your knowledge."

It does if one person on a large team did it without others' knowledge. This doesn't occur for most, non-copyleft code. At that point, if it's a derivative work, then your codebase looses its value as it gets GPL'd just because GPL'd code touched it. Preventing that outcome would require both preventative methods and constant vigilance.

Kind of like avoiding getting sick from a virus and spreading it everywhere.

Note: A former Microsoft employee told me in a prior discussion they identified this exact risk and took steps to prevent it. I never knew if it was paranoia or what could legally happen. Interesting to find last year that my hypothetical scenario actually played out to a degree in FOSS's arch-rival of that period.

[dragonwriter]

> > The license doesn't attach without your knowledge.

> It does if one person on a large team did it without others' knowledge.

No, the license never attaches to your code without a positive decision on your part to offer your code under the license.

Now, if someone does something that makes the code legally a derivative work of GPL code without knowledge of the person releasing the code, the obligation to release the code under the GPL or not at all may be created and breached without knowledge of the person doing the release, but the license still has not attached to your code.

When the breach is detected, you may decide that the best way to deal with the breach is to offer the code under the GPL.

> This doesn't occur for most, non-copyleft code.

Any code, under any license with any obligations attached to redistribution of derivative works -- or which simply prohibits redistributing such works -- can create unexpected breaches when someone includes them in a work without knowledge of the person responsible for the release; copyleft licenses are not at all special in this regard.

> At that point, if it's a derivative work, then your codebase looses its value as it gets GPL'd just because GPL'd code touched it.

No, again, your code base only becomes GPL because you choose to offer it under the GPL. IIRC, the few GPL violation cases (in the US, at least) that have gone to court and not been settled have resulted in fines and injunctions on distributing the GPL-dependent software.

> Note: A former Microsoft employee told me in a prior discussion they identified this exact risk and took steps to prevent it. I never knew if it was paranoia or what could legally happen. Interesting to find last year that my hypothetical scenario actually played out to a degree in FOSS's arch-rival of that period.

The description of the GPL as "viral" was central to Microsoft's PR effort against Free Software in general and Linux in particular.

So, its not really surprising to hear that from that source.

[nickpsecurity]

"the obligation to release the code under the GPL or not at all may be created and breached without knowledge of the person doing the release, but the license still has not attached to your code."

This is the specific concern. The name of the license isn't what people call a virus: it's the obligation it attaches to things.

"copyleft licenses are not at all special in this regard."

Damage to most copyright violations is usually a fine/settlement, publishing source of the component (not app), removal, and so on. Not an obligation to loose one's own I.P. entirely. How many common licenses that cut/pasted code or included libraries might be affected by require redistribution of the application's source in full once it gets in a release? I thought it was a non-zero amount that was pretty low for most sources. Whereas, bumbling around on a site with GPL stuff drives it up singificantly specifically due to copyleft.

" the few GPL violation cases (in the US, at least) that have gone to court and not been settled have resulted in fines and injunctions on distributing the GPL-dependent software."

Now we're talking the actual results. The virus metaphor could be dropped if it was clear that this was the worst thing that could happen and that component would just have to be dropped/replaced with non-GPL stuff. Them doing it that way is certainly reassuring. Trick is, could they instead force app using it to go GPL? Guess it hinges on enforceability of that obligation.

"The description of the GPL as "viral" was central to Microsoft's PR effort against Free Software in general and Linux in particular. So, its not really surprising to hear that from that source."

From an ex-employee mocking that source's stance on GPL as paranoid, to be clear. Not surprising, though.