Less than a week after it announced plans for a new platform called BBX for its smartphones and tablet, Research In Motion is facing the threat of legal action from a software company that claims that BBx is the trademark of software it sells.

Basis International has taken legal action to preserve and protect its "longstanding ownership" of the BBx trademarked operating system-independent language, database and toolset, it said.

Basis said a press release from RIM announcing a new BlackBerry operating system named BBX is causing confusion among users of BBx software, and could potentially harm its reputation for enabling cross-platform application development, it added.

RIM announced on Tuesday that it will use the BBX name for a future software platform for BlackBerry smartphones and PlayBook tablets, based on the QNX software used in the PlayBook.

The US Patents and Trademark Office registered the trademark BBx to Basis on July 4, 2006, in the field of "Computer programs and associated documentation providing tools and programming language to enable software developers to create and prepare business, internet and applications software".

However, RIM dismissed Basis' concerns, saying that although it has not yet seen the legal complaint, it does not believe the marks are confusing because the two companies are in different lines of business.