26.02.2013 Views

unravelling the myth around open source licences - IViR

unravelling the myth around open source licences - IViR

unravelling the myth around open source licences - IViR

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

10. The licence must be technology-neutral.<br />

The OSD has become a widely cited standard for determining which <strong>licences</strong> are ‘<strong>open</strong><br />

<strong>source</strong>’. Most people consider today <strong>the</strong> terms <strong>open</strong> <strong>source</strong> and free software to be synonymous.<br />

Stallman does not agree with <strong>the</strong> way in which <strong>the</strong>se terms are used interchangeably, since in his<br />

opinion <strong>the</strong> term ‘<strong>open</strong> <strong>source</strong>’ does not place enough emphasis on <strong>the</strong> freedom of <strong>the</strong> user. 47<br />

Stallman advises to use both terms at <strong>the</strong> same time.<br />

2.2 The core stipulations of <strong>open</strong> <strong>source</strong> <strong>licences</strong><br />

As mentioned earlier, an important number of <strong>licences</strong> deserve <strong>the</strong> qualification ‘<strong>open</strong> <strong>source</strong>’.<br />

Because <strong>the</strong> majority of <strong>the</strong>se <strong>licences</strong> are used exclusively for one software project while <strong>the</strong>ir<br />

content and purpose is often similar, <strong>the</strong>y will not be discussed separately. An attempt will be made<br />

to describe <strong>the</strong> most important aspects of <strong>open</strong> <strong>source</strong> <strong>licences</strong>. Attention will be paid to specific<br />

problems that may arise when <strong>the</strong> most popular <strong>licences</strong> are used. We will first discuss <strong>the</strong> <strong>licences</strong><br />

that are important in ei<strong>the</strong>r a quantitative or a qualitative sense.<br />

2.2.1 The use of different <strong>licences</strong><br />

Seen from a quantitative standpoint<br />

Most <strong>open</strong> <strong>source</strong> software is published under <strong>the</strong> GPL. This can be inferred from statistics<br />

produced by FreshMeat, <strong>the</strong> largest on-line catalogue of Unix and cross-platform software published<br />

under an <strong>open</strong> <strong>source</strong> licence. 48 Nearly seventy percent (68.05%) of <strong>the</strong> catalogued projects (totalling<br />

35.973) are published under <strong>the</strong> GPL. Slightly more than 5 percent (5.85%) of projects are brought<br />

out under <strong>the</strong> Lesser GPL (LGPL). The LGPL is fur<strong>the</strong>r discussed in paragraph 4.1.1. The BSD<br />

licence comes third with a use of 3.58% while o<strong>the</strong>r <strong>licences</strong> have a user percentage of 2.55% or less.<br />

These figures are confirmed by o<strong>the</strong>r research. Lerner and Tirole in May 2002 have analysed<br />

SourceForge, a website offering free space to projects developing programs through <strong>the</strong> Internet. 49<br />

Based on this study it appears that more than seventy percent of software is brought out under <strong>the</strong><br />

GPL. The LGPL is used for ten percent of <strong>the</strong> projects and <strong>the</strong> BSD license is currently used for 7<br />

percent of <strong>the</strong> projects. The figures mentioned above are in accordance with <strong>the</strong> results of research<br />

done by Evans and Reddy. 50<br />

In both studies <strong>the</strong> percentages have not been weighed: no distinction is made based on <strong>the</strong><br />

amount of computer code or <strong>the</strong> number of developers that are involved. A survey was conducted to<br />

categorise <strong>the</strong> use of licenses according to <strong>the</strong> amount of code distributed. 51 This study has been<br />

carried out making use of <strong>the</strong> RedHat distribution version 7.2, a compilation of <strong>open</strong> <strong>source</strong> software<br />

that is distributed via <strong>the</strong> Internet and CD-ROM. In this study, <strong>the</strong> number of lines in <strong>the</strong> <strong>source</strong><br />

code of all files was counted, and it was <strong>the</strong>n checked under which licence this code was brought out.<br />

It appears that 50% of <strong>the</strong> total of code lines is licensed under <strong>the</strong> GPL. Second, comes <strong>the</strong> MIT<br />

licence, a BSD-type licence that is used for 8% of code lines. The third place is occupied by <strong>the</strong><br />

LGPL, used for 7.5% of code lines.<br />

47 See Richard Stallman, “Why Free Software is better than “Open Source””, at http://www.gnu.org/philosophy/free-softwarefor-freedom.html.<br />

48 http://freshmeat.net/stats/ (lastly visited on 4 January 2005).<br />

49 Lerner and Tirole 2002, pp. 21-23.<br />

50 Evans and Reddy 2003, pp. 354-355.<br />

51 Wheeler 2001.<br />

13

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!