closed platform

For example, in telecommunications, the services and applications accessible on a cell phone on any given wireless device were formerly tightly controlled by the mobile operators. The operators limited the applications and developers that were available on users' home portals and home pages.{{Citation needed|date=June 2016}} Thus, a service provider might restrict user access to users whose account exhausted the pre-paid money on their account. This has long been a central issue constraining the telecommunications sector, as developers face huge hurdles in making their applications available to end-users.{{Citation needed|date=June 2016}}

In a more extreme example, the regulated 1970s American telephone system, Bell, owned all the hardware (including all phones) and had indirect control over the information sent through their infrastructure. It was an open government-sanctioned natural monopoly regulated by the Communications Act of 1934. However, in the landmark case Hush-A-Phone v. United States, Bell unsuccessfully sued a company producing plastic telephone attachments.

More generally, a walled garden can refer to a closed or exclusive set of information services provided for users. Similar to a real walled garden, a user is unable to escape this closed environment except through the designated entry/exit points or if the walls are removed.{{cite web|title=Definition of: walled garden|url=https://www.pcmag.com/encyclopedia_term/0,1237,t=walled+garden&i=54187,00.asp|website=PCmag.com |access-date=13 June 2012}}

A 2008 Harvard Business School working paper, entitled "Opening Platforms: How, When and Why?", differentiated a platform's openness/closedness by four aspects and gave example platforms:{{cite news|url=http://www.hbs.edu/faculty/Publication%20Files/09-030.pdf |title=Opening Platforms: How, When and Why? |author1=Eisenmann, Thomas R. |author2=Parker, Geoffrey |author3=Van Alstyne, Marshall |publisher=Harvard Business School |access-date=30 June 2015 |date=31 August 2008 |pages=2 |doi=10.2139/ssrn.1264012|work=Harvard Business School Entrepreneurial Management Working Paper No. 09-030}}

Some examples of walled gardens include:

• In the 1990s, AOL developed what later was called its "walled garden" model of service.{{cite book|last1=Wu|first1=Tim|author-link1=Tim Wu|title=The Attention Merchants: The Epic Scramble to Get Inside Our Heads|date=2016|publisher=Penguin Random House|location=New York|isbn=9780385352017|page=210}} The idea was to preferentially offer sponsored content to users when possible. During this period, CBS paid to provide sports content, ABC paid to provide news, and 1-800-Flowers paid to be the default florist for anyone seeking one. This strategy became AOL's first good method for selling advertisements. In its time, this method was highly profitable to AOL.
• Amazon's Kindle line of eReaders.{{cite journal|date=29 February 2012|title=How the e-book landscape is becoming a walled garden|author=Mathew Ingram|journal=Gigaom|url=http://gigaom.com/2012/02/29/how-the-e-book-landscape-is-becoming-a-walled-garden/|access-date=7 October 2012|archive-date=18 February 2021|archive-url=https://web.archive.org/web/20210218001740/https://gigaom.com/2012/02/29/how-the-e-book-landscape-is-becoming-a-walled-garden/|url-status=dead}}{{cite web|title=With New Kindle, Bezos Proves Ecosystems Matter More Than Hardware|author=Jay Akasie|date=7 September 2012|url=http://www.minyanville.com/sectors/technology/articles/amazon-new-kindle-amazon-kindle-family/9/7/2012/id/43794|access-date=7 October 2012|archive-url=https://web.archive.org/web/20120911014834/http://www.minyanville.com/sectors/technology/articles/amazon-new-kindle-amazon-kindle-family/9/7/2012/id/43794|archive-date=11 September 2012|url-status=dead}} As an October 2011 Business Insider article, entitled "How Amazon Makes Money From The Kindle" observes: "Amazon's Kindle is no longer just a product: It's a whole ecosystem." Moreover, as Business Insider noted "The Kindle ecosystem is also Amazon's fastest-growing product and could account for more than 10% of the company's revenue next year."{{cite journal |url=http://www.businessinsider.com/kindle-economics-2011-10 |title=How Amazon Makes Money From The Kindle; Amazon's Kindle is no longer just a product: It's a whole ecosystem |author=Pascal-Emmanuel Gobry|date=18 October 2011 |journal=Business Insider |access-date=29 November 2013}}
• Apple iOS and other mobile devices, which are restricted to running pre-approved applications from a digital distribution service.{{cite news |title=Battle for the Internet (Part III of series): Walled gardens look rosy for Facebook, Apple – and would-be censors|author=Charles Arthur |journal=The Guardian |date=17 April 2012}}{{cite news |magazine=Time |date=1 July 2011 |author=Ben Bajarin |title=Why Competing With Apple is So Difficult |url=https://techland.time.com/2011/07/01/why-competing-with-apple-is-so-difficult/}}
• Barnes & Noble's Nook devices. In late December 2011, B&N began pushing the automatic, over-the-air firmware update 1.4.1 to Nook Tablets that removed users' ability to gain root access to the device and the ability to sideload applications from sources other than the official Barnes and Noble NOOK Store (without modding).{{cite web |url=http://www.itworld.com/mobile-wireless/234809/kindle-fire-and-nook-tablet-both-get-upgraded-reduced-functionality |website=ITWorld.com |author=Smith, Peter |date=21 December 2011 |access-date=10 January 2012 |title=Kindle Fire and Nook Tablet both get "upgraded" with reduced functionality |archive-date=8 January 2012 |archive-url=https://web.archive.org/web/20120108015721/http://www.itworld.com/mobile-wireless/234809/kindle-fire-and-nook-tablet-both-get-upgraded-reduced-functionality |url-status=dead }}{{cite web |url=http://pcper.com/category/tags/update |website=PCPerspective.com |author=Verry, Tim|date=21 December 2011 |access-date=10 January 2012 |title=Kindle Fire and Nook Tablet Receive Root Access Killing Software Updates}} Nook HD devices were similarly "closed", until May 2013, when BN opened its ecosystem somewhat by permitting users to install the Google Play Store and the various Android apps offered there, including those of rivals, such as Audible.com, ComiXology, Kindle, Kobo, and Google itself.{{cite news|work=CNet|title=Barnes & Noble adds Google Play store to its tablets: The Nook HD and HD+ may not be fully "open" Android tablets, but they're now much more open than they were|date=2 May 2013|author=Carnoy, David|url=http://www.cnet.com/news/barnes-noble-adds-google-play-store-to-its-tablets/}}
• The Encrypted Media Extensions specification provides APIs to control playback of encrypted content. This is part of the World Wide Web Consortium's web standards and was authored by members working from Google, Microsoft and Netflix.{{Cite web|url=https://www.w3.org/TR/encrypted-media/|title=Encrypted Media Extensions|website=www.w3.org|language=en|access-date=11 July 2017}}
• Kwangmyong, the national intranet service that operates in North Korea. It operates as a "walled garden" network, as no information from overseas is permitted to enter the network without government approval.
• Verizon Wireless' CDMA network and policies effectively prohibiting activation of non-Verizon sanctioned devices on their network. Verizon Wireless is frequently noted (and often criticized) for this practice.{{Citation needed|date=November 2013}}
• Permissioned blockchains have been called the “walled gardens” of 2017.[https://medium.com/@soodsandeep/permissioned-blockchains-are-the-virgin-margaritas-of-cryptocurrency-2da976d93ce4 Permissioned blockchains are the virgin margaritas of cryptocurrency]
• Video game consoles have a long history of walled gardens, with developers needing to purchase licences to develop for the platform, and, in some cases, needing editorial approval from the console manufacturer prior to publishing games.{{cite web |url=https://news.ycombinator.com/item?id=2249630 |title=We Are the App Store |work=Hacker News |publisher=Y Combinator |access-date=29 November 2013}}{{cite journal |journal=ITU News |url=https://itunews.itu.int/En/1953-The-world-of-video-games.note.aspx |number=10 |year= 2011 |title=The world of video games: Trends in video games and gaming |author=Martin Adolph of ITU’s Telecommunication Standardization Bureau (TSB)}}{{cite web |url=https://gsbapps.stanford.edu/cases/detail1.asp?Document_ID=1285 |title=Electronic Arts in 1995 |author1=Robert A. Burgelman |author2=Carrie C. Oliver |publisher=Stanford Graduate School of Business |pages=16 pages |date=1 August 1997 |id=SM24-PDF-ENG |access-date=29 November 2013}}
• Super-apps such as WeChat, X, and Telegram have been called walled gardens by critics.{{Cite web |last=Liao |first=Rita |date=2022-10-08 |title=Elon Musk's X app for 'everything' might be a non-starter in the US |url=https://techcrunch.com/2022/10/08/elon-musk-x-everything-wechat-tesla-app/ |access-date=2022-10-28 |website=TechCrunch |language=en-US}}

• Data portability
• Vendor lock-in
• Business ecosystem
• Dark web
• Defective by Design
• Digital rights management
• Enshittification
• Gated community
• Open source
• Software protection dongle
• Registered user

{{Reflist}}

{{Embedded systems}}

Category:Application programming interfaces

Category:Computing platforms

Category:Hardware restrictions