Maintenance and future of the Open Data Commons licences


As a thought, that specific point sounds a bit weird. If some group independently makes a license and calls it (say) “ODbL v2.0”, wouldn’t they be be putting themselves in a bad position re: trademark law?


@justinclift It would be bad rep but the term ‘ODbl’ is not registered for trademark protection and nor should it be. (please @rufuspollock correct me if I’m wrong)

This is indeed a problem how do you protect the quality and avoid confusion (like ‘green’ and ‘open’ washing) . What we can do as a community is to make sure this does not happen and take action when it does happen. So please when in doubt point it out !


Looking at the Advisory Council, it looks like Mike Collinson should be changed to Simon Poole. Mike was chair of the OSMF LWG, and that’s now Simon.


For public sector information (PSI), it seems that the OKI has now resolved this discussion in favor of CC‑BY‑4.0 if attribution is required and CC0‑1.0 otherwise. Indeed, ODC‑By‑1.0 and ODbL‑1.0 are now implicitly deprecated in this domain. Provocative, I know, so here is my source: Lämmerhirt (2017).

There are nonetheless quite a few problems with Lämmerhirt (2017) which the OKI might like to consider fixing and reissuing. Major shortcomings:

  • deprecation of Open Data Commons licenses in the context of government licensing policy should be stated explicitly
  • no detailed treatment on common license compatibilities, particularly between the ODC and CC families (leading one to suspect no such analysis exists)
  • the paragraph on permissive and copyleft licensing is simply incorrect

Minor issues:

  • no such thing as “civic law” (should be civil law?)
  • graphic 1 shows a previously unknown CC‑SA license, moreover license versions should be stated as version-agnostic interoperabilities do not exist
  • license annotation on graphic 2 is confusing and potentially ambiguous (I did eventually work out what “CC BY/SA 4.0” meant)
  • section on misuse of data provisions is useful but some remarks are wayward, for instance US fair use is intentionally framed to provide discretion by courts
  • full references should be given and shortened URLs especially should be avoided for reasons of information and linkrot (as per Wikipedia guidelines)
  • the term public sector information should be preferred over government information as the former is broader in scope

I suspect that problems in determining cross-license compatibilities — should these even exist — have ultimately led to the Creative Commons family becoming dominant outside of legacy usage. That, in my view, is a good outcome for open data.

Happy to answer questions or provide further background.


Lämmerhirt, Danny (December 2017). Avoiding data use silos: how governments can simplify the open licensing landscape. Open Knowledge International. Cambridge, United Kingdom.


As an experiment I’ve taken a copy of the ODbL 1.0 text and started to annotate sections of it to highlight design decisions, key clauses, areas where I feel the licence is unclear and some clarifying statements.

I’m using so if anyone is interested they can reply to individual comments.




Here is a good example of line-by-line license analysis which might serve as a template:

Peterson, Scott K. (23 March 2018). Why so little love for the patent grant in the MIT license?.


Hello @ldodds I am looking for a reliable source that confirms (or otherwise) that ODC‑By‑1.0 licensed material is inbound compatible with ODbL‑1.0 licensed databases. Can someone provide an authority for this? Thanks in advance, R.


Sigh, really, recommending CC BY 4.0 as a data license is such a bad idea, that one needs to ask the question if OKI actually ever studied the text of the licence and the consequences on downstream users of such licensed data. The rest of the points wrt governments not creating additional licences and so on are clearly OK, but CC BY 4.0 is not the answer to that problem.


Given that we (the OSMF LWG) clearly have the largest body of first hand experience with the ODbL, we’re glad to help with any effort that could lead to an ODbL revision and is not a purely academic exercise (I have an old list of issues somewhere that I can probably dig out).


PS: wrt academic exercise: there is still that small textual clarification to the ODC that hasn’t gone anywhere


@SimonPoole It would be useful if you could explain why CC‑BY‑4.0 is unsuited for data in your view. Do you advocate CC0‑1.0 or OBbL‑1.0 or some other license instead? The reason I ask is that the open energy modeling community is debating a set of open data licensing recommendations at present. In most cases, neither do we get to choose a license, that is the clear prerogative of the data provider. And most, I would say, would wish to be credited, hence the need for BY licensing. (PS: thanks for responding to my earlier suggestion for an edit.)


It would be useful if you could explain why CC‑BY‑4.0 is unsuited for data in your view. Do you advocate CC0‑1.0 or OBbL‑1.0 or some other license instead? The reason I ask is that the open energy modelling community is debating a set of open data licensing recommendations at present. In most cases, neither do we get to choose a license, that is the clear prerogative of the data provider. And most, I would say, would wish to be credited, hence the need for BY licensing

Definitely requiring downstream attribution is an understandable requirement by data providers and while it does create some downstream complications, I believe it should be catered for.

To understand the issue with CC BY and CC BY 4.0 it is important to realize that CC expects them to work in a classical “layers of copyright” fashion, that is, while the creator of “Adapted Material” can licence the changes how they see fit, the “layer” of CC BY licenced material continues to exist and any terms that the “Adapted Material” is distributed on must not conflict with the CC BY licence.

Now if CC BY was truly only a licence that required downstream attribution, this wouldn’t really be an issue as providing attribution in a suitable fashion should in general not interfere with downstream reuse. However CC BY and more so CC BY 4.0 add additional restrictions on how you can downstream distribute so licensed material.

2.a.5. Downstream recipients.

  A. ...

  B.  No downstream restrictions. You may not offer or impose any additional
       or different terms or conditions on, or apply any Effective Technological 
       Measures to, the Licensed Material if doing so restricts exercise of the 
       Licensed Rights by any recipient of the Licensed Material.

Obviously this disallows using DRM distribution for any Adapted Material that you’ve created and further can be read as not allowing any kind of terms that would not at least allow the rights listed in 2.a.1 to be exercised by any downstream recipient. Oddly enough CC claims that CC BY-SA 4.0 is compatible with CC BY, but if the SA terms aren’t "additional or different terms " that “restricts exercise of the Licensed Rights” I need to twist my brain in to several knots.

Now this again wouldn’t be so bad in a typical data reuse scenario, lets say you have CC BY licensed address data that you’ve included in your geo-data and you’ve modified the locations to be better, you can argue that the terms would actually only apply to the original and modified data. Previous CC BY versions explicitly mentioned Collections of works, It seems as if the explicit mention was dropped as this is typically already the law and it wasn’t necessary to repeat it.

Enter CC BY 4.0 Section 4.b

if You include all or a substantial portion of the database contents in a database in which You have Sui Generis Database Rights, then the database in which You have Sui Generis Database Rights (but not its individual contents) is Adapted Material; and

With other words inclusion in a database in the EU that is eligible for Sui Generis Database protection forces you to apply 2.a.5 B to your complete database.

This is not just me making things up, see for the results of our discussions with CC (note: Section 4 didn’t play a role in this as it was clear that we would need to require a waiver of 2.a.5 B because of the relaxed terms for “Produced Works” in the ODbL in any case).

My take on CC BY is that is really a share-alike licence that simply doesn’t specify the exact licence you need to utilize, but otherwise has the same advantages and disadvantages as a SA licence. Characterizing it as an “attribution-only” licence which is so popular is in any case extremely misleading.

Naturally if you are not considering a scenario in which there will be multiple downstream reuses of what you are producing and that some of them may have more restrictive usage terms, you may come to other conclusions.


In my opinion it’s a mistake to continue spreading such alarmistic messages as “CC BY […] is really a share-alike licence”. CC BY 4.0 is simply a modern license which includes protection from certain abuses which would otherwise make the license terms meaningless and deprive users of all their rights in practice. Such abuses are especially common with databases.

People supposedly choose CC BY for their databases because they want to really ensure (as far as private contracts can go) that the spirit of the license is respected and they’re attributed, even beyond moral rights and ethical practices. If they didn’t care so much, they could just use CC-0. Completely waiving the totally pointless and broken sui generis rights remains the safest legal solution, while attepting to use it for good is extremely difficult, but as we know it’s not always possible.


You do realize that you are making my point? I have nothing against the use of CC BY when the way it works is declared properly. But the fact is that most users of it assume that it is something like CC0 + an attribution requirement, which it clearly isn’t. I realize that there is a certain interest in not rocking the boat here and with CC, as you illustrate nicely, but, sorry to say, that doesn’t change the facts.