分かりやすい オープンソースの説明プレゼン

LiveJournalのBradが、オープンソースについて説明したプレゼンテーション。「ソースコードとバイナリの違いを知らないぐらいのWindowsユーザーが、飽きず見れるように書いた」とのことで、英語ですが分かりやすいです。ギャグも入りつつ、重要なポイントはしっかりおさえられてる感じ。

brad's life - Open Source presentation

GPLとBSD-ishの違いの説明がなるほどでした。

BSD-ish

• you may use this code and do whatever with it, except sue us if it doesn't work (no warranty)
• you may ship it in commercial products
• make changes, sell the binaries, and never give back the changed source code
• used by researchers / academics / companies
• BSD-ish is Most Permissive.

GPL

• The license of the Free Software Foundation and Free Software hippies worldwide.
• if you distributed a changed version, you must shared your changes
• (if you only change it for personal/internal use, don't need to)
• Ver popular, GPL is Most Restrictive

リストの下の方ほど、制約が強い

• Public domain (no copyright, gutenburg.org)
• Copyright:
  • Open Source
    • BSD-ish (some of Comet's javascript, Ben and my CPAN perl code, FreeBSD)
    • GPL (Linux, LiveJournal, Wordpress)
  • Proprietary
    • Source Available (Movable Type)
    • Source not available & gratis
      “freeware”, “shareware” (Doom*, Commander Keen)
    • Source not available & must pay
      Windows, Photoshop, Macromedia Breeze