“Twitter’s proposed transparency report is no less entitled to free speech protections than ‘literature’ or ‘movies,'” said the brief filed on behalf of BuzzFeed, NPR, the Washington Post, PEN America, the Guardian and First Look Media.

The brief reflects the media’s newfound legal interest into what has largely been a tech industry fight, but also shows how digital media companies like BuzzFeed are finally taking up the legal fight for free speech, a burden that has long been borne almost entirely by old-line newspaper companies.

“Corporations 1 & 2”

Meanwhile, a separate filing shows that a phone and internet company are also weighing in on the Twitter case, but in the guise of “Corporations 1 & 2.” The companies (which are likely Verizon and Google or Yahoo) are using the pseudonyms at the direction of a judge, and are muzzled in part because they are already before an appeals court in another national security case over the right to disclose government demands.

The right of internet companies to discuss security letters has become more pressing since 2013 , when leaked documents from Edward Snowden revealed massive surveillance operations by the U.S. government. Those operations rely on obtaining information from tech and phone companies, and have been facilitated by the legal process governing Patriot Act letters, as well as a related process for NSA demands.

In response, companies like Twitter have come to claim that free speech and the public interest give them the freedom to disclose how many NSA and FBI letters they receive in the first place. The companies stress they are not arguing for the right to disclose the contents of the letters, since doing so could jeopardize ongoing investigations, but only the existence of the letters.

The docket also shows that a group of other entities — the Wikimedia Foundation, CloudFlare, Sonic, Wickr, Credo Mobile and Automattic (publisher of WordPress.com) — filed a brief in support of Twitter.

Here’s a copy of the media companies’ filing with some of the key parts underlined. Note that a key part of the argument turns on whether the federal judge has authority to hear the case in the first place (as the companies argue) or if the case belongs instead in a controversial secret court (as the Justice Department claims).

Media Amicus in Twitter Case

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This article was updated at 12:35pm ET to note that Automatic is the publisher of WordPress.com; an earlier version said “WordPress” (which refers to the software used by the company, WordPress.com). This article was also updated at 1:40pm on Thursday to clarify that it was the Wikimedia Foundation (not Wikipedia) that was on the amicus brief.