YouTube
Content accessibility

YouTube offers users the ability to view its videos on web pages outside their website. Each YouTube video is accompanied by a piece of HTML that can be used to embed it on any page on the Web. This functionality is often used to embed YouTube videos in social networking pages and blogs. Users wishing to post a video discussing, inspired by, or related to another user's video can make a "video response". The eleven character YouTube video identifier (64 possible characters used in each position), allows for a theoretical maximum of 64 or around 73.8 quintillion (73.8 billion billion) unique ids.

YouTube announced that it would remove video responses for being an underused feature on August 27, 2013. Embedding, rating, commenting and response posting can be disabled by the video owner. YouTube does not usually offer a download link for its videos, and intends for them to be viewed through its website interface. A small number of videos can be downloaded as MP4 files. Numerous third-party web sites, applications and browser plug-ins allow users to download YouTube videos.

In February 2009, YouTube announced a test service, allowing some partners to offer video downloads for free or for a fee paid through Google Checkout. In June 2012, Google sent cease and desist letters threatening legal action against several websites offering online download and conversion of YouTube videos. In response, Zamzar removed the ability to download YouTube videos from its site. Users retain copyright of their own work under the default Standard YouTube License, but have the option to grant certain usage rights under any public copyright license they choose.

Since July 2012, it has been possible to select a Creative Commons attribution license as the default, allowing other users to reuse and remix the material.
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