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