FAQ - OpenStreetMap Wiki

FAQ - OpenStreetMap Wiki
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For License change, see
Open Data License FAQ
For Modelling questions, see
Map Features
For Legal aspects, see
Legal FAQ
For Developers, see
Developer FAQ
For Wiki, see
Wiki FAQ
In addition to this FAQ, there is a collaboratively edited
question and answer site
where you can read more questions about OpenStreetMap and ask your own. Feel free to
contact
the community as well.
Contents
Is it OpenStreetMap or Open Street Maps?
Why OpenStreetMap?
2.1
Why are you making OpenStreetMap?
2.2
Why don't you just use Google Maps/whoever for your data?
2.3
How can a project like this create accurate maps?
2.4
You seem to have a lot of existing map data. Where did it come from?
2.5
Why is the data sometimes inconsistent?
2.6
Who owns OpenStreetMap?
2.7
What does your license allow me to do with the OSM Data?
How do I help?
3.1
How can I get involved?
3.2
How do you communicate?
3.3
Is there any ongoing scholarly research on OpenStreetMap?
Editing
4.1
What images and maps may I use to make maps from?
4.2
I have just made some changes to the map. How do I get to see my changes?
4.3
Do I need to own a GPS device to contribute to the map?
4.4
What GPS should I buy? Can I use a "satnav" in-car unit?
4.5
I have public domain non-GPS data, how can I upload it?
4.6
Why is the satellite imagery low resolution? Is there other satellite imagery that I can use that has more detail? Can you update it? How often is it updated?
4.7
What shall I do for roads that have multiple values for a tag?
4.8
Another user has changed something I edited. I think they're wrong. How do I contact them?
4.9
How do I track edits of a region?
4.10
How to remove an object from the map?
4.11
What's the problem with mechanical edits?
Editing with JOSM
5.1
I tried to download my town/city/region – why doesn't it work?
5.2
I want to create a very long way – how do I download OSM data for such a big area?
Using OSM maps and data
6.1
Can I use data from OSM?
6.2
How do I link to a particular latitude and longitude on OSM from my own website?
6.3
How can I display maps on my website?
6.4
How can I download a map?
6.5
How can I extract information [e.g. POI's] from OpenStreetMap (like a list and location of all of the churches in a certain area)?
6.6
How can I download this data and put it in my GPS?
6.7
Why doesn't 'Export' work?
6.8
Where can I find software using OSM data?
6.9
Which map shows names of places in the chosen language or transliterations of foreign language names?
6.10
How to find roads within a radius of XY km from a given point?
6.11
Why won't you delete roads on private property?
Questions from GIS people
7.1
What geographic datums are used in OpenStreetMap?
7.2
What is the map scale for a particular zoom level of the map?
7.3
Why aren't you using Open Geospatial Consortium (OGC) schemas and software for OpenStreetMap?
7.4
What Geotagging do you use?
7.5
Where does the elevation data found on some OSM maps, such as relief shading, and elevation profiles for routes, come from?
Admin
8.1
Why doesn't my login work?
8.2
How can I close my account?
8.3
Can I have more than one account?
8.4
Help – someone keeps deleting/reverting my edits. What do I do?
8.5
I think someone's been entering copyrighted data – how do we deal with that?
8.6
I am a copyright owner and my content is being used in OpenStreetMap without permission
8.7
I found a website using OSM that doesn't display the license
References
Is it OpenStreetMap or Open Street Maps?
OpenStreetMap is the correct spelling. One word, three capital letters, one map. OpenStreetMap is also a
Trademark
Why OpenStreetMap?
Why are you making OpenStreetMap?
Geographical data (geo data) is not free in many parts of the world. Generally these places have given the task of mapping to various government agencies who in return get to make money by selling the data back to you and me. If you live in one of these countries, then your taxes pay for the mapping and then you have to pay again to get a copy of it. In the USA, crude data (such as
TIGER
) is in the public domain, however refined data and finished maps are generally commercially copyrighted.
Data from commercial maps sometimes contain lies, or
Copyright Easter Eggs
, to catch anyone copying it. These Easter eggs take the form of fake or missing streets, or features like churches and schools that don't in fact exist. If you make a map using their data, they can say "ah-ha! Gotcha!" from looking if you also copied these fake pieces of map. The map may also just be incorrect because for example you bought it a year ago and a path has been dug up in your local park since, or someone just made a mistake.
If you accept all of this then you still can't do anything with the data but photocopy it. In lots of places that's illegal too if you go beyond your fair use rights. You can't correct a street name, or add the pub/bar over the road, or use the data in a computer program without paying a lot of money. More money than you probably have. What about sending it to a friend, enclosing it in an invitation or posting it on a notice board? A lot of these are less legal than you might think.
Advances in technology like cheap GPS units mean you can now create your own maps, in collaboration with others and have none of the restrictions outlined above. The ability to do so allows you to regain a little bit of the community you live in – if you can't map it, you can't describe it.
Why don't you just use Google Maps/whoever for your data?
Short answer:
Because that data is copyrighted and owned by multiple organisations like the Ordnance Survey. Google/whoever just licenses it. Sometimes data itself powering this services is not available at all, or blocked by unfriendly licensing or extreme fees.
Long answer:
Most hackers around the world are familiar with the difference between "free" as in "free beer" and as in "free speech". Google Maps is free as in beer, not as in speech.
If your project's mapping needs can be served simply by using the Google Maps API, fine. That's not true of every project, though. We need a free dataset which will enable programmers, citizen scientists, social activists, cartographers and the like to fulfill their plans without being limited either by Google's API or by their
Google Maps/Google Earth Additional Terms of Service
When using Google Maps/Google Earth, you may not […] use Google Maps/Google Earth to create or augment any other mapping-related dataset (including a mapping or navigation dataset, business listings database, mailing list or telemarketing list)
(c) No Creating Content From Google Maps Content. Customer will not create content based on Google Maps Content. For example, Customer will not: (i) trace or digitize roadways, building outlines, utility posts, or electrical lines from the Maps JavaScript API Satellite base map type; (ii) create 3D building models from 45° Imagery from Maps JavaScript API; (iii) build terrain models based on elevation values from the Elevation API; (iv) use latitude/longitude values from the Places API as an input for point-in-polygon analysis; (v) construct an index of tree locations within a city from Street View imagery; or (vi) convert text-based driving times into synthesized speech results.
The data used in
Google Maps
is either owned by Google itself, or sourced from
NAVTEQ
and
Tele Atlas
, two big mapping companies. They, in turn, have obtained some of this data from national mapping agencies (such as the
Ordnance Survey
). Since they've made significant financial investments to gather this data, these organisations are understandably protective of their copyright.
If you collect data from Google Maps in this way, you are creating a "derived work". Any such data retains the copyright conditions of the original. In practice, this means your data is subject to the licensing fees, and contractual restrictions, of these map providers. That's exactly what OpenStreetMap is trying to avoid.
Please don't be misled by considerations of
software
copyright, or of Terms of Use. The Google Maps API can be incorporated into open source projects, sure. But this only governs how you use the software – it doesn't have any implications whatsoever for the data displayed by this API, which is still under copyright. This is similar to how you can use an open source media player to play copyrighted songs: the copyright of the software doesn't change the copyright of the data that it uses.
(It's not yet clear whether it's ok to create a derived work from aerial photography : some readings of UK law suggest that you can do this without 'inheriting' the copyright in the photography. A definitive ruling on this could open up new avenues for OpenStreetMap and similar projects, but in the absence of such a ruling, we're continuing with the approach of sourcing our own, 100% independent data.)
Further reading:
Google Maps/Google Earth Additional Terms of Service
The OpenStreetMap mailing list
archives
. You may want to search them for phrases like "derived works", and for a thread in October 2005 called "
London locations
".
Can I use Google Street View?
on help.openstreetmap.org
How can a project like this create accurate maps?
By the very nature of the wiki-style process there is no guarantee of accuracy of any kind. Then again, few proprietary maps do not carry a guarantee of accuracy, either.
The essence of a wiki-style process is that all users have a stake in having accurate data. If one person puts in inaccurate data, maliciously or accidentally, the other 99.9% of people can check it, fix it, or get rid of it. The vast majority of good-intentioned participants can automatically correct for the few bad apples.
As they say, though, your mileage may vary. The Wikipedia project has shown that a large amount of good quality data can be collected but it can be difficult to weed out the inevitable errors.
A full editing history is stored for each user. Since April 21, 2009, users can attach Wikipedia-like edit summaries to their edits, and there is a History tab on
the main page
that shows recent edits to the selected area.
At the moment the best way to answer this question is to judge for yourself. One way is to pick an area that you know well and use the OpenStreetMap viewer to see how well the map data corresponds to your own knowledge. Maybe you will see something wrong or inaccurate. More likely you will find there's nothing there yet. At this stage, our main challenge is to extend our coverage, without copying from existing maps. As on Wikipedia, it's easy to edit, so you can help!
You seem to have a lot of existing map data. Where did it come from?
Many keen contributors, and
sporadic imports of data from open-licensed sources
. In areas where there are no such data sources (most areas) we have to start from a blank slate, and head out there to survey the streets ourselves. Despite starting from scratch, we have achieved a good level of completion in many places.
Why is the data sometimes inconsistent?
"OpenStreetMap is a free editable map of the whole world. It is made by people like you." Which means the database will always be subject to the whims, experimentation, and mistakes of the community; this is
precisely OSM's strength
since, among other things, it allows our data to quickly accommodate changes in the physical world.
In OpenStreetMap it is normal that one town is mapped in extreme detail, another has mapped road and bicycle infrastructure and nothing else while another is not mapped at all (for now!).
Who owns OpenStreetMap?
All of us do. The data and software are owned by you, me and many others, the contributors.
There is an organisation called the
OpenStreetMap Foundation
which exists to protect, promote, and support the project, but does not own the data.
What does your license allow me to do with the OSM Data?
See
Legal FAQ
and
License
for more information.
How do I help?
How can I get involved?
Anyone can help by improving map data!
Common
Editors
are the
iD
editor on
osm.org
and
JOSM
Go Map!!
Is an easy to use iOS/iPadOS/macOS editor for OSM with support for adding POIs, editing nodes and ways, offline support, undo-redo, copy-paste tags, make ways straight, circular or rectangular and more.
StreetComplete
is an Android app that is usable by people with no experience or knowledge about OpenStreetMap editing.
More ways to help are listed on the
Getting Involved
page.
How do you communicate?
Main article:
Contact channels
The OpenStreetMap community is large, spread across many locations, speak different languages, and focus on different areas of interest. So the answer is we don't always communicate very well! But we do our best.
Mailing lists
. The
talk
list is very high traffic. This is where most discussions take place and decisions are made. There is also lists for
dev
and
newbies
and over twenty other lists. See
mailing lists
The OpenStreetMap Community Forum at
community.openstreetmap.org
is a good place to get help.
OpenStreetMap Slack –
Discord servers
Live chat through IRC –
irc://irc.oftc.net#osm
. See
Contact#IRC
for a list of other OpenStreetMap channels on IRC.
Some announcements and interesting developments are made on the blog at
blog.openstreetmap.org
OSM Community Index
) is an index of local and global channels
And there's this wiki. It's used more for reference than for discussion.
Is there any ongoing scholarly research on OpenStreetMap?
Numerous universities worldwide are studying various aspects of OpenStreetMap or are using OSM data in their research. See
Research
for more information.
Editing
What images and maps may I use to make maps from?
Most maps have copyright restrictions. This includes any data from "free beer" sites as Google Maps and Wikipedia and printed paper maps, even if you scanned them yourself. Most commercial aerial/satellite photography is also copyrighted.
You should not use copyrighted maps in any way while editing OpenStreetMap (unless it is compatible with
our license
). "Using" includes tracing over the map, copying a name from the map, or pinpointing a coordinate on the map. To be on the safe side, we tend to regard all of these as a form of copying, or "creating a derived work". Generally speaking, it's best not to even look at copyrighted maps while you are editing OpenStreetMap.
So what
can
you use? Not very much, which is why we are doing all this re-surveying from scratch. However OSM has permission to use some
datasources
including imported
TIGER
data in the USA,
AND Data
in the Netherlands, and recent
aerial imagery
from
Bing
and
Mapbox
See also page about
imports
I have just made some changes to the map. How do I get to see my changes?
Because map images take a little while to render, the map
tiles
are cached, and only updated on a periodic basis, rather than immediately after you edit it.
The "standard" map appearing on
OpenStreetMap.org
tends to be updated after a couple of minutes, but can also be longer depending on server load. When you try to view the map for that area, it will flag the area to the rendering software.
Please keep in mind that the browser will cache the map and "tiles" at particular zoom levels are not updated all at once. Therefore during the update period you may see your changes at some zoom level, while not at another, they will be visible after a while. Depending on your browser, you can try to 'force reload/refresh' the content. Check your software for the key combination (
Ctrl
F5
and
Shift
Ctrl
are common). See more at
Browser cache
Note that very low zoom levels are updated much less often.
If your data is still not appearing and you are pretty sure that the one or the other renderer has done its job, then you might have a tagging problem. Check that:
Run
JOSM validator
or, if edit is old, check area on
Osmose
. Or use other
QA
tool
all your ways are
tagged with something appropriate that will be rendered
(e.g.
highway=tertiary
). However, do not tag an object with
unsuitable tags
just to get it shown on a specific map.
your
tags are in lower case
highway
instead of
HIGHWAY
or
Highway
you use an
underscore “
instead of a space in tags such as
highway=bus_stop
See also
Question: I have made edits, but they don't show up on the map
and
Question: How often does the main (mapnik) map get updated
for a more thorough explanation.
Do I need to own a GPS device to contribute to the map?
No. When OpenStreetMap first launched the map started as a blank canvas. GPS devices were therefore useful to determine the position of roads and other
map features
. Today we have numerous
data sources
that can be used to determine an accurate position, including
aerial imagery
from
Bing
, and of course the existing OpenStreetMap data.
You can still
upload
your GPS track logs (also called traces) to OpenStreetMap, so that you and others can trace over them to draw maps. This is particularly useful for rural and mountainous areas where aerial imagery may be of low quality, or inaccurately aligned. You'll need to be a registered OSM user to do this. See
upload
for guidance and
traces
for a list of publicly available GPS traces.
What GPS should I buy? Can I use a "satnav" in-car unit?
See
GPS reviews
. Some in-car units will generate the tracklogs that OSM use, but you
must
make sure you turn off the "Snap to Road" option – otherwise your tracklog will be linked to the copyrighted map in your satellite navigation system.
I have public domain non-GPS data, how can I upload it?
If you have public domain data obtained from non-GPS sources (for example, a municipality's public information website), it
may
be suitable for importing. If you want to import then see the
Import Guidelines
. Importing can be a highly technical process and both technical experience and extensive OSM experience are required to complete an import successfully. The challenge with imports are not primarily technical, but a community challenges. You need to talk to local mappers and check that they are happy with the import as well as the wider community.
Your best option may be making the data available to the community and if someone is interested they can proceed with the import process.
Why is the satellite imagery low resolution? Is there other satellite imagery that I can use that has more detail? Can you update it? How often is it updated?
The
Aerial Imagery
is from a variety of sources that we have permission to use –
Bing
is the most popular worldwide and have the largest coverage. But for many areas there is more local superior one. The resolution and age of the imagery varies, and it is not updated on a regular basis. You may even notice the age and quality of imagery from same source may be different in your town. See
Aerial Imagery
for more details. OSM neither controls nor owns the satellite imagery, so we cannot request updates.
What shall I do for roads that have multiple values for a tag?
Where different tag values apply to different sections of a road, we always split the road up into several ways. Something you think of as a single road, does
not
need to be represented as a single way. Splitting a road up into many ways is normal mapping practice. e.g. for short sections where
bridge
yes
applies, or sections of road with different
maxspeed
=*
values.
If you worry about how to represent the whole length of road, you might look at using
relations
to re-group ways.
WikiProject Europe/E-road network
gives some examples of this.
If you have multiple different values for the same key, applying to the same element, then you may need to use the
semi-colon value separator
. For example,
nat_ref
B500;B550
for a section of road that is designated both B500 and B550.
Another user has changed something I edited. I think they're wrong. How do I contact them?
To find the name of the user who last edited an object,
On one of the map layers on OpenStreetMap.org, zoom in and click the
button to enter query mode. Click the map on something you are interested in, hover over the results, and choose one. You can then scroll down and select "View History" to look at all the changes that have been made.
Alternatively, zoom in as far as you can and then use the
Layers
button on the map (you may need to scroll the right panel to see it) and check the checkbox
Map Data
. Click
the feature of which you want to know the history
Finally, it shows all the properties of the feature on the data panel and a link 'View History' at the bottom left. Click
View History
to see all the changes.
In iD (the in-browser editor), select the object and click on "View in OpenStreetMap" at the bottom left. That opens a new browser tab looking at that object; you can then scroll down and select "View History" as above.
In JOSM, Select the object and then either hit CTRL+H or enable the
Author's panel
by selecting the icon of a blue book on the left side bar or hitting ALT+Shift+H or hit Ctrl+Shift+H to open the history page in OpenStreetMap.
To discuss a change with a user, add a comment onto the changeset where they changed it. That will be sent to them as an email. Incidentally, just moving the position of a way means the node positions are changed but the way itself is not; you may need to look at the history of nodes too.
For more information about more difficult issues see
this
. Also see
revert
How do I track edits of a region?
See the list of various tools at
Quality assurance#Monitoring Tools
How to remove an object from the map?
If a physical object (e.g. a building) does not exist and is not visible on the latest aerial or satellite imagery, simply remove it.
If a physical object (e.g. a building) has been recently demolished, it can be removed, but it is good practice to change the tags, for example, from [building] to [demolished:building=yes]. Such a building will no longer be visible on the map, but this will ensure that someone who maps from satellite imagery will not add it again.
When it comes to POIs such as shops, restaurants, pharmacies that are located on a particular premises. Usually there are traces of previous shop so we don't remove the node, but mark it with a suitable
prefix
such as
disused:*
=*
or
abandoned:*
=*
or
was:*
=*
. If there is no longer a trace (e.g. a signboard) of the previous POI and there is a sign in the window, e.g. "for rent", you can tag such an object as
shop
vacant
. See also
Keep the history
Remember that you can't remove an object/road/whatever just because access to it is
private
. In general objects seen on aerial imagery can be added.
See more at
Nonexistent features
What's the problem with mechanical edits?
See:
What's the problem with mechanical edits?
Editing with
JOSM
See also the
JOSM Guide
I tried to download my town/city/region – why doesn't it work?
Chances are the area you tried to select is too large and the server probably timed out before getting the data to you. In order to conserve OSM's bandwidth, you cannot download or select to edit an area larger than 0.3 degrees in either dimension through the web interface. For editing, it is recommended to work on smaller areas.
If you really want larger areas of data, the best approach would be to download
planet.osm or an extract
. These are snapshots of the OSM database for the entire planet or a specific area.
I want to create a very long way – how do I download OSM data for such a big area?
In order to be able to easily handle long roads, you should
not
make one long road out of it. You should rather split the road into several ways. As a rule of thumb, no way should be longer than 10-15 km. Typically, they will actually be much shorter.
Applications like route planners for example will be able to easily join the ways to one road again. This type of application will need to postprocess the OSM data anyway.
For motorways for example, it makes sense to make a way from one exit to the next. Also, intersections of motorways should be the point where you split a road into ways.
Using OSM maps and data
Main article:
Using OpenStreetMap
Can I use data from OSM?
Yes! You must follow
rules
. Typically it means that you must provide an
attribution
How do I link to a particular latitude and longitude on OSM from my own website?
You can link to the slippy map with a specific latitude and longitude and zoom level:
?mlat=[latitude in degrees with decimals]
&mlon=[longitude in degrees with decimals]
&zoom=[zoom level 1-19]

(newlines here inserted for readability)
Coordinates must be positive for North and East, negative for South and West. For example, 28° 44' 16.09"S would be
mlat=-28.737803
and 24° 45' 49.33"E would be
mlon=24.763703
(that's Kimberley, South Africa, in case you're wondering).
Zoom levels: 1 = full zoom out, 19 = full zoom in.
Or link to a
static image
How can I display maps on my website?
Read Getting Started With Leaflet on switch2osm.org
How can I download a map?
Use the 'Share' button to download in PNG, JPEG, SVG or PDF format. If you need other formats, see the
Export
page on this wiki.
How can I extract information [e.g.
POI
's] from OpenStreetMap (like a list and location of all of the churches in a certain area)?
If you want a large batch of POIs, download
planet.osm
or an extract and then use software that processes OSM data (e.g.
osmosis
) to extract your desired information.
Or use the
API
. See
getting poi data from OSM
for a more detailed explanation.
How can I download this data and put it in my GPS?
If you have a Garmin unit, see
OSM Map On Garmin
. Several users provide
ready-made Garmin format maps
for you to download and copy to your GPS.
Why doesn't 'Export' work?
When the rendering servers have a high load from traffic to the main map some of the exports gets temporarily disabled. This is because the rendering of custom images from the export tab takes a lot of resources compared to the slippy map.
If you want to use the exports you can try again later or see other
alternatives
Where can I find software using OSM data?
For current software using OSM, see the
Software
page or its
category
, and also
neat stuff
for more experimental ideas.
For a more development-related angle, see
Routing
(and its
category
), the
Beginners Guide topic on usage
, and the
Developers
' pages.
Which map shows names of places in the chosen language or transliterations of foreign language names?
See
Map internationalization
How to find roads within a radius of XY km from a given point?
Isochrones can be determined, for example, on OpenRouteService:
– by selecting "reach" in the panel. See also other tools on
Isochrone
Why won't you delete roads on private property?
See
Why we won't delete roads on private property
Questions from GIS people
What geographic datums are used in OpenStreetMap?
OpenStreetMap uses the
WGS 84
lat/lon data exclusively. All uploaded tracks and edits should always be in WGS 84, the default data for GPS receivers.
What is the map scale for a particular zoom level of the map?
Main article:
Slippy_map_tilenames#Resolution_and_Scale
Why aren't you using Open Geospatial Consortium (OGC) schemas and software for OpenStreetMap?
We choose technology for openstreetmap.org based on speed & flexibility. Some OGC standards and implementations fit this bill, but others do not. We used to use MapServer for serving static versions of our maps, but unfortunately we found it to be unthreaded, slow, and hard to extend – we replaced it with
Mapnik
. If you'd like to
develop integration with OGC tools
, let us know.
See
Why not GPX?
for a similar discussion about why GPX was rejected as a transport format.
What Geotagging do you use?
Main article:
Geotagging
Where does the elevation data found on some OSM maps, such as relief shading, and elevation profiles for routes, come from?
The elevation data comes from
SRTM
Admin
Why doesn't my login work?
There are two different logins for the OSM project: one is for this wiki only, and the other is for the website, API and the forum. You need to
register on the website
to edit OSM data.
How can I close my account?
Typically there's no need to close/delete an account on openstreetmap.org. It's no problem to simply leave it lying dormant. Want to remove identifying information? It's easy to change your display name, and edit your profile description. If you
do
want to completely delete your account for some reason: log-in, go to
My Settings
and use the 'Delete Account...' button. Please take note of the warning: The account deletion process is final, and cannot be reversed! You will also see details of exactly what is being deleted. If you have further queries about the deletion process or the retained information you can send an email to the
support address
. Please send the email from the email account associated with your OSM account.
Can I have more than one account?
Yes – see
OpenStreetMap account#Account Names and Multi Account Policies
Help – someone keeps deleting/reverting my edits. What do I do?
Please see the
disputes
page for details.
I think someone's been entering copyrighted data – how do we deal with that?
If you find data that you suspect may have been copied from a copyrighted source or imported from a copyrighted source into OpenStreetMap without the owner's permission, please:
Contact the user via using the 'send message' link from their user page (i.e. "www.openstreetmap.org/user/[user-name]") with the evidence. Be polite: it is important to remember that you might be wrong, they might have permission or it could be a simple misunderstanding.
See
Contact
for more information.
If there is no response (after 5 days) or you are deeply unconvinced by the response, email your evidence to the
OSM Foundation
so that the problem can be investigated.
It may be that your report will be posted to the legal-talk mailing list (or a country specific list if this is more appropriate) for discussion – if so, you will be informed so you can join the discussion.
I am a copyright owner and my content is being used in OpenStreetMap without permission
If you are the copyright owner or represent the copyright owner, we can assist you directly by e-mail. You may contact us at data@osmfoundation.org with an informal request. Please cite the exact content in question. Correspondence is answered by a small team of volunteers.
This address is not for requesting permission to copy content from OpenStreetMap.
If you prefer to use or make a formal OCILLA request, you can send it to our designated agent.
Digital Millennium Copyright Act Notice
I found a website using OSM that doesn't display the license
Our
license
says you have to display both the author and license (see
Legal FAQ
). If it's a major page, please read
Lacking proper attribution
References
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FAQ
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