The Open Source Initiative (OSI) was formed in 1998 by Eric Raymond and Bruce Perens to promote the use of open source software. OSI uses the Open Source Definition to determine if a software license qualifies as open source, which was based on Debian's Free Software Guidelines and allows for relaxed copyright restrictions and distribution of source code. While open source software legally qualifies as free software, Richard Stallman and the Free Software Foundation oppose using the term "open source" and fear compromising ideals of freedom. The consensus term "free and open source software" is increasingly used to describe the common ground between the two approaches.