Groups as diverse as the Business Software Alliance and MoveOn.org oppose it.

FORBES: Save the Internet: Take Action Against SOPA

According to the Business Software Alliance, more than one-third of all PC software in use is pirated.

CNN: The next piracy panic: Software

The Business Software Alliance (BSA), a nonprofit trade group of which Microsoft is a key member, said it supports the actions which the software giant is taking.

CNN: Microsoft campaign takes aim at global Internet fraud

This happens every year, the Business Software Alliance releases its figures on how much the theft of software costs the industry: and every year they get their numbers wrong.

FORBES: Business Software Alliance Gets It Wrong on Software Theft Again

As of today, the add-on seems to flag 333 sites as SOPA friendly, from industry groups like the Motion Picture Association of America to the Business Software Alliance, to companies like Apple.com to Nintendo.com, to Newscorp-owned sites like Fox.com and Sky.com.

FORBES: Chrome Add-on Tells You When You're Browsing A Site That Supports SOPA

According to the letter from UCITA's Ring, the following software industry organizations are supporting the draft -- industry antipiracy body the Business Software Alliance (14 members, among those Microsoft Corp, Lotus Development Corp. and Adobe Systems Inc.), the Software Information Industry Association, Silicon Valley Software Industry Coalition and the Computer Software Industry Association.

CNN: Opponents blast proposed U.S. software law

And, of course, if you choose not to pay for such software and pirate it instead, outfits like the Microsoft-backed Business Software Alliance will turn your former employees into tipsters, audit your software use and sue you.

FORBES: Magazine Article