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+#+TITLE: Software Source Code in Research and Open Science
+#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
+#+BEAMER_HEADER: \title[Archiving and Referencing source code~~~~~~~CC-BY 4.0]{Software Source Code in Research and Open Science}
+#+AUTHOR: Roberto Di Cosmo
+#+EMAIL: roberto@dicosmo.org
+#+BEAMER_HEADER: \date[July 2020]{July 2020}
+#+BEAMER_HEADER: \author[@rdicosmo~~~~~~Roberto Di Cosmo~~~~~~@swheritage]{Roberto Di Cosmo\\Director, Software Heritage}
+#+KEYWORDS: software, heritage, legacy, preservation, knowledge, mankind, technology, prospective, software development
+#
+# prelude.org contains all the information needed to export the main beamer latex source
+# use prelude-toc.org to get the table of contents
+#
+#+LATEX_HEADER: \usepackage{tcolorbox}
+#+LATEX_HEADER: \definecolor{links}{HTML}{2A1B81}
+#+LATEX_HEADER: \hypersetup{colorlinks,linkcolor=,urlcolor=links}
+#+INCLUDE: "../../common/modules/prelude-toc.org" :minlevel 1
+
+#+INCLUDE: "../../common/modules/169.org"
+* Software Source Code is knowledge
+** Software source code: /human readable/ and /executable knowledge/
+  :PROPERTIES:
+  :CUSTOM_ID: softwareisdifferent
+  :END:
+*** Harold Abelson, Structure and Interpretation of Computer Programs \hfill (1985)
+    /“Programs must be written for people to read, and only incidentally for machines to execute.”/
+#+BEAMER: \pause
+*** Apollo 11 source code ([[https://archive.softwareheritage.org/swh:1:cnt:0c1741c1fb0150f111625d02277407f628c31bac;origin=https://github.com/virtualagc/virtualagc;visit=swh:1:snp:cdcd2bc43331a436e8c659ba93175ef7d7eb339b;anchor=swh:1:rev:4e5d304eb7cd5589b924ffb8b423b6f15511b35d;path=/Luminary116/THE_LUNAR_LANDING.agc;lines=244-260/][excerpt]])                     :B_block:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: 0.48
+    :BEAMER_env: block
+    :END:
+   #+LATEX: \includegraphics[width=\linewidth]{apollo-11-cranksilly.png}
+   # excerpt of routine that asks astronaut to turn around the LEM
+#+BEAMER: \pause
+*** Quake III source code ([[https://archive.softwareheritage.org/swh:1:cnt:bb0faf6919fc60636b2696f32ec9b3c2adb247fe;origin=https://github.com/id-Software/Quake-III-Arena;visit=swh:1:snp:687ac8cdbfab3b78b7f301abee5f451127f135fc;anchor=swh:1:rev:dbe4ddb10315479fc00086f08e25d968b4b43c49;path=/;lines=549-572/][excerpt]])                           :B_block:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: 0.45
+    :BEAMER_env: block
+    :END:
+   #+LATEX: \includegraphics[width=\linewidth]{quake-carmack-sqrt-1.png}
+   # smart efficient implementation of 1/sqrt(x) on a CPU without special support
+#+BEAMER: \pause
+*** 							    :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Len Shustek, Computer History Museum \hfill (2006)
+    \hfill /“Source code provides a view into the mind of the designer.”/
+   
+*** Distinguishing features					   :noexport:
+    - /executable/ and /human readable/ knowledge (an /all time new/)
+      + even hardware is... software! (VHDL, FPGA, ...)
+      + /text files are forever/
+    - naturally /evolves/ over time
+      + the /development history/ is key to its /understanding/
+    - complex: large /web of dependencies/, millions of SLOCs
+*** In a word							   :noexport:
+    - software /is not just another/ sequence of bits
+    - a software archive /is not just another/ digital archive
+** Source code is /special/ (software is /not/ data)
+*** Software /evolves/ over time
+    - projects may last decades
+    - the /development history/ is key to its /understanding/
+#+BEAMER: \pause
+*** Complexity :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=python3-matplotlib.pdf, width=.6\linewidth
+    :END:
+    - /millions/ of lines of code
+    - large /web of dependencies/
+      + easy to break, difficult to maintain
+    - sophisticated /developer communities/
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+#+BEAMER: \pause
+*** A vast part is not research software
+    - industry and communities drive standards,
+      build the necessary support layers
+** Source code is /special/, cont'd
+*** Versioning, granularity
+   - Project :: “Inria created OCaml and Scikit-learn”\pause
+   - Release :: “2D Voronoi Diagrams were introduced in CGAL 3.1.0”\pause
+   - Precise state of a project :: “This result was produced using commit 0064fbd...”\pause
+   - Code fragment :: “The core algorithm is in lines 101 to 143 of the file parmap.ml contained in the precise state of the project corresponding to commit 0064fbd....”
+   #+BEAMER: \pause
+*** Authors can have multiple roles:
+   - Architecture, Management, Development, Documentation, Testing, ...
+** Software Source code: pillar of Open Science
+*** Three pillars of Open Science :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .4
+    :END:
+#+latex: \begin{center}
+#+ATTR_LATEX: :width \extblockscale{1.2\linewidth}
+file:PreservationTriangle.png
+#+latex: \end{center}
+#+BEAMER: \pause
+*** A plurality of needs :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .6
+    :END:
+    - Researcher :: 
+     - *archive* and *reference* software used in articles
+     - *find* useful software
+     - get *credit* for developed software
+     - verify/reproduce/improve results
+ #+BEAMER: \pause
+    - Laboratory/team :: track software contributions
+     - produce reports / web page
+ #+BEAMER: \pause
+    - Research Organization :: know its *software assets*
+     - technology *transfer*
+     - impact *metrics*
+** What is at stake \hfill in increasing order of difficulty
+*** Archival
+    Research software artifacts must be properly *archived*\\
+    \hfill make sure we can /retrieve/ them (/reproducibility/)
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+\vspace{-.5em}
+*** Identification
+    Research software artifacts must be properly *referenced*\\
+    \hfill make sure we can /identify/ them (/reproducibility/)
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+\vspace{-.5em}
+*** Metadata
+    Research software artifacts must be properly *described*\\
+    \hfill make it easy to /discover/ them (/visibility/)
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+\vspace{-.5em}
+*** Citation
+    Research software artifacts must be properly *cited* /(not the same as referenced!)/\\
+    \hfill to give /credit/ to authors (/evaluation/!)
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+\vspace{-.5em}
+#+BEAMER: \pause
+**** 
+    We need infrastructures /designed for/ software source code: \pause now we have one!
+* Software Heritage
+** Software Heritage, in a nutshell
+#+BEAMER: \transdissolve
+#+INCLUDE: "../../common/modules/swh-goals-oneslide-vertical.org::#goals" :only-contents t :minlevel 3
+** Addressing the four needs
+*** Archive (8B+ files, 130M+ projects!)
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+#+ATTR_LATEX: :width .8\linewidth
+   file:swh-dataflow-merkle.pdf
+\vspace{-1em}
+   - [[https://save.softwareheritage.org][save.softwareheritage.org]]
+   - [[https://deposit.softwareheritage.org][deposit.softwareheritage.org]]
+# (HAL, IPOL)
+#+BEAMER: \pause
+*** Reference (20 billion SWHIDs)                                   :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    [[https://www.softwareheritage.org/2020/07/09/intrinsic-vs-extrinsic-identifiers/][Intrinsic, decentralised, cryptographically strong identifiers, SWHIDs]]
+\vspace{-1em}
+#+ATTR_LATEX: :width 1.02\linewidth
+    file:SWHID-v1.4_3.png
+    Now supported [[https://www.softwareheritage.org/2020/05/13/swhid-adoption/][in SPDX 2.2, Wikidata]] etc.
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Describe                                                        :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - Intrinsic metadata from source code
+    - Contributed the [[https://codemeta.github.io/codemeta-generator/][Codemeta generator]]
+#+BEAMER: \pause
+*** Cite                                                            :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - Contributed software citation style
+      [[https://www.ctan.org/tex-archive/macros/latex/contrib/biblatex-contrib/biblatex-software][biblatex-software, v 1.2-2 now on CTAN]]
+** Software Heritage for research                                  :noexport:
+*** Archive
+      - a /universal/ archive: collects /all/ software, not only academic software
+      - /harvests/ source code worldwide /([[https://archive.softwareheritage.org][8B+ files from 130M+ projects in July 2020]])/
+      - your software may be there already... if not, please [[https://save.softwareheritage.org][/save its code now/]]!
+#+BEAMER: \pause
+*** Reference
+      - [[https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html][SWHID]]: /intrinsic/, /decentralised/, /cryptographically strong/ identifiers
+#        + for /over 20 billion artifacts/
+#        + [[https://www.softwareheritage.org/2020/05/13/swhid-adoption/][IANA registered, adopted in industry and WikiData]]
+      - enhance articles with /source code references/ for reproducibility
+#+BEAMER: \pause
+*** Cite
+      - [[https://www.ctan.org/tex-archive/macros/latex/contrib/biblatex-contrib/biblatex-software][biblatex-software]] : a dedicated bibliographic style for software!
+#+BEAMER: \pause
+*** 
+    \hfill Detailed guidelines [[https://www.softwareheritage.org/save-and-reference-research-software/][are available online]]! \hfill \mbox{}
+* Demo time!
+** A walkthrough
+   - Browse [[https://archive.softwareheritage.org][the archive]]
+   - Get and use SWHIDs ([[https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html][full specification available online]])
+   - cite software [[https://www.softwareheritage.org/2020/05/26/citing-software-with-style/][with the biblatex-software style]] from CTAN
+   - Example use in a research article: compare Fig. 1 and conclusions 
+      - in [[http://www.dicosmo.org/Articles/2012-DaneluttoDiCosmo-Pcs.pdf][the 2012 version]]
+      - in [[https://www.dicosmo.org/share/parmap_swh.pdf][the updated version]] using SWHIDs and Software Heritage
+   - Example use in a research article: extensive use of SWHIDs in [[https://www.dicosmo.org/Articles/2020-ReScienceC.pdf][a replication experiment]]
+   - [[https://save.softwareheritage.org][Trigger archival]] of your preferred software in a breeze
+   - [[https://doc.archives-ouvertes.fr/en/deposit/deposit-software-source-code/][curated deposit in SWH via HAL]], see for example: 
+      [[https://hal.archives-ouvertes.fr/hal-02130801][LinBox]], [[https://hal.archives-ouvertes.fr/hal-01897934][SLALOM]], [[https://hal.archives-ouvertes.fr/hal-02130729][Givaro]], [[https://hal.archives-ouvertes.fr/hal-02137040][NS2DDV]], [[https://hal.archives-ouvertes.fr/lirmm-02136558][SumGra]], [[https://hal.archives-ouvertes.fr/hal-02155786][Coq proof]], ...
+   - rescue landmark legacy software, see the [[https://www.softwareheritage.org/swhap/][SWHAP process with UNESCO]]
+** Using the archive                                               :noexport:
+*** Archiving (research) software
+    - via HAL deposit, see for example: 
+      [[https://hal.archives-ouvertes.fr/hal-02130801][LinBox]], [[https://hal.archives-ouvertes.fr/hal-01897934][SLALOM]], [[https://hal.archives-ouvertes.fr/hal-02130729][Givaro]], [[https://hal.archives-ouvertes.fr/hal-02137040][NS2DDV]], [[https://hal.archives-ouvertes.fr/lirmm-02136558][SumGra]], [[https://hal.archives-ouvertes.fr/hal-02155786][Coq proof]], ...
+    - via [[https://archive.softwareheritage.org/browse/origin/save/][Save code now]]
+*** Intrinsic identifiers for /reproducibility/
+    - see the iPres 2018 article \url{bit.ly/swhpidpaper}
+    - example: [[https://archive.softwareheritage.org/swh:1:cnt:41ddb23118f92d7218099a5e7a990cf58f1d07fa;origin=https://github.com/chrislgarry/Apollo-11;lines=53-82/][swh:1:cnt:41ddb23118f92d7218099a5e7a990cf58f1d07fa;lines=53-82]]
+*** Wayback machine
+    - find lost source code
+    - example: [[https://archive.softwareheritage.org/browse/origin/https://gitorious.org/parmap/parmap.git/directory/][lost source code of Parmap cited in a 2012 research article]]
+** Software Heritage for research, cont'd                          :noexport:
+*** Describe
+      - curated /deposit/: [[https://www.softwareheritage.org/2018/09/28/depositing-scientific-software-into-software-heritage/][moderated via *HAL*]], and via scholarly journals
+      - software specific metadata via the [[https://codemeta.github.io/codemeta-generator/][CodeMeta generator]]
+      #+BEAMER: \pause
+*** Cite
+      - working group on software citation
+      - [[https://www.ctan.org/tex-archive/macros/latex/contrib/biblatex-contrib/biblatex-software][biblatex-software]] released to cite software in LaTeX bibliographies
+      #+BEAMER: \pause
+*** Reference archive :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    See the work done at https://swmath.org
+    #+BEAMER: \pause
+*** Landmark legacy software :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    See the [[https://www.softwareheritage.org/swhap/][SWHAP process with UNESCO]]
+    #+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** 
+   \hfill Now part of the /French National Plan for Open Science/ \hfill\mbox{}
+* The way forward
+** An international, non profit initiative\hfill built for the long term
+  :PROPERTIES:
+  :CUSTOM_ID: support
+  :END:
+*** Sharing the vision                                              :B_block:
+  :PROPERTIES:
+  :CUSTOM_ID: endorsement
+  :BEAMER_COL: .5
+  :BEAMER_env: block
+  :END:
+   #+LATEX: \begin{center}{\includegraphics[width=\extblockscale{.4\linewidth}]{unesco_logo_en_285}}\end{center}
+   #+LATEX: \vspace{-0.8cm}
+   #+LATEX: \begin{center}\vskip 1em \includegraphics[width=\extblockscale{1.4\linewidth}]{support.pdf}\end{center}
+    #+latex: \small And many more ...\\
+    #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/testimonials}
+*** Donors, members, sponsors                                       :B_block:
+    :PROPERTIES:
+    :CUSTOM_ID: sponsors
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+   #+LATEX: \begin{center}\includegraphics[width=\extblockscale{.4\linewidth}]{inria-logo-new}\end{center}
+   #+LATEX: \begin{center}
+   # #+LATEX: \includegraphics[width=\extblockscale{.2\linewidth}]{sponsors-levels.pdf}
+   #+LATEX: \colorbox{white}{\includegraphics[width=\extblockscale{1.4\linewidth}]{sponsors.pdf}}
+   #+LATEX: \end{center}
+#   - sponsoring / partnership :: \hfill \url{sponsorship.softwareheritage.org}
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Research collaboration                              :B_picblock:noexport:
+  :PROPERTIES:
+  :BEAMER_COL: .5
+  :BEAMER_env: picblock
+  :BEAMER_OPT: pic=Qwant_Logo, leftpic=true
+  :END:
+    source code search engine
+*** See more                                                       :noexport:
+    \hfill\tiny\url{http:://www.softwareheritage.org/support/testimonials}
+*** Global network                                      :B_picblock:noexport:
+    :PROPERTIES:
+    :BEAMER_COL: .5
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=fossid, leftpic=true, width=.3\linewidth
+    :END:
+     - first *independent mirror*
+     - increased reliability
+** Come in, we're open!
+*** Software Heritage :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .42
+    :END:
+    - /universal/ source code archive
+    - /intrinsic/ identifiers (SWHIDS)
+    - /open/, /non profit/, long term
+    - /infrastructure/ for Open Science
+#+BEAMER: \pause
+*** You can help improve science!                                   :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .55
+    :END:
+    - /use/ SWH and /save/ relevant source code
+    - /build on/ SWH (see swmath.org and ipol.im) 
+    - /contribute/ to SWH: /it is open source/
+    - spread the word
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+#+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+  #+BEGIN_EXPORT latex
+  \begin{thebibliography}{Foo Bar, 1969}
+  \footnotesize
+  \bibitem{Abramatic2018} Jean-François Abramatic, Roberto Di Cosmo, Stefano Zacchiroli\newblock
+  \emph{Building the Universal Archive of Source Code}, CACM, October 2018
+  \href{https://doi.org/10.1145/3183558}{(10.1145/3183558)}
+  \bibitem{DiCosmo2019} Roberto Di Cosmo, Morane Gruenpeter, Stefano Zacchiroli\newblock
+  \emph{Referencing Source Code Artifacts: a Separate Concern in Software Citation},\newblock
+  CiSE 2020 \href{https://dx.doi.org/10.1109/MCSE.2019.2963148}{(10.1109/MCSE.2019.2963148)}
+  \href{https://hal.archives-ouvertes.fr/hal-02446202}{(hal-02446202)}
+  \bibitem{alliez:hal-02135891} Pierre Alliez, Roberto Di Cosmo, Benjamin Guedj, Alain Girault, Mohand-Said Hacid, Arnaud Legrand and  Nicolas Rougier\newblock
+  \emph{Attributing and referencing (research) software: Best practices and outlook from Inria}, \newblock
+  CiSE 2020 \href{https://doi.ieeecomputersociety.org/10.1109/MCSE.2019.2949413}{(10.1109/MCSE.2019.2949413)}
+  \href{https://hal.archives-ouvertes.fr/hal-02135891}{(hal-02135891)}
+  \end{thebibliography}
+  #+END_EXPORT
+
+* Appendix :B_appendix:
+  :PROPERTIES:
+  :BEAMER_env: appendix
+  :END:
+** Software and Software Source code
+   #+INCLUDE: "../../common/modules/source-code-different-short.org::#thesourcecode" :only-contents t :minlevel 3
+** Largest software archive, shared infrastructure
+   #+latex: \begin{center}
+   #+ATTR_LATEX: :width 0.7\linewidth
+   file:SWH-as-foundation-slim.png
+   #+latex: \end{center}
+   #+BEAMER: \pause
+   #+latex: \centering
+   #+ATTR_LATEX: :width \extblockscale{.9\linewidth}
+   file:2020-04-07-growth.png
+** A revolutionary infrastructure for software source code
+  #+BEAMER: \vspace{-2mm}
+*** The /graph/ of Software Development                          :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_COL: .5
+    :BEAMER_OPT: pic=git-merkle/merkle-vertical, leftpic=true, width=.4\linewidth
+    :END:
+    All software development with its history,
+    in *a single graph* ...
+ #+BEAMER: \pause \vspace{-2mm}
+*** The /blockchain/ of Software Development                     :B_picblock:
+    :PROPERTIES:
+    :BEAMER_opt: pic=merkle, leftpic=true, width=.8\linewidth
+    :BEAMER_env: picblock
+    :BEAMER_COL: .5
+    :BEAMER_act:
+    :END:
+    ... a single *Merkle* graph, with /intrinsic ids/ for *traceability*
+ #+BEAMER: \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** A /pillar/ of Open Science                                   :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=PreservationTriangle.png,leftpic=true, width=.6\linewidth
+    :BEAMER_COL: .5
+    :END:
+    Reference *archive* of\\
+    Research Software
+ #+BEAMER: \pause
+*** Reference platform for /Big Code/                            :B_picblock:
+    :PROPERTIES:
+    :BEAMER_opt: pic=universal, leftpic=true, width=.4\linewidth
+    :BEAMER_env: picblock
+    :BEAMER_COL: .5
+    :BEAMER_act:
+    :END:
+   *One uniform data structure* enables /massive/ machine learning
+   for *quality, cybersecurity*, etc.
+
+** Precious asset, /endangered heritage/                           :noexport:
+*** We are at a turning point
+    software *now a critical asset for society*, but key
+    scientists/developers *are passing away*, and source code is getting *lost or
+    misplaced* while software development *skyrockets*!
+#+BEAMER: \pause
+*** 
+    To enable next generation research and software development we need \\
+    \hfill{} a /common/, /non profit/, /long term/, /shared/ infrastructure that provides
+*** A catalog
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .3
+    :END:
+#+BEGIN_EXPORT latex
+\begin{center}
+\includegraphics[width=.8\linewidth]{myriadsources}
+\end{center}
+#+END_EXPORT 
+#+BEAMER: \pause
+*** An archive
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .3
+    :END:
+#+BEGIN_EXPORT latex
+\begin{center}
+\includegraphics[width=.8\linewidth]{fragilecloud}
+\end{center}
+#+END_EXPORT 
+#+BEAMER: \pause
+*** A research infrastructure                                       :B_block:
+    :PROPERTIES:
+    :BEAMER_COL: .3
+    :BEAMER_env: block
+    :END:
+#+BEGIN_EXPORT latex
+\begin{center}
+\includegraphics[width=.9\linewidth]{atacama-telescope}
+\end{center}
+#+END_EXPORT 
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+** Exponential growth and increasing complexity                    :noexport:
+\vspace{-0.5em}
+*** Growth of /globally original known content/ (source: [[https://hal.archives-ouvertes.fr/hal-02158292v2][Rousseau, Di Cosmo, Zacchiroli 2019]])
+    #+ATTR_LATEX: :width .9\linewidth
+    file:revision_content_growth_wide.png
+    \vspace{-1em}
+    trend over 20 years: /original content doubles every 22 months/
+    (i.e. *~45% per year*)
+#+BEAMER: \pause 
+*** Complexity of the software ecosystem \hfill 8000+ langs      :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=python3-matplotlib.pdf, width=.5\linewidth
+    :END:
+    - /millions/ of lines of code
+    - large /web of dependencies/
+      + easy to break, difficult to maintain
+    - decentralised /developer communities/
+* Milestones
+** Some key dates
+   #+INCLUDE: "../../common/modules/swh-key-dates.org::#keydates" :minlevel 3 :only-contents t
+** Policy highlight
+*** :B_column:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: .53
+    :BEAMER_env: column
+    :END:
+    #+ATTR_LATEX: :width .7\linewidth
+    file:UNESCOParisCallMeeting.png
+    UNESCO, Inria, Software Heritage invite\\
+    [[https://en.unesco.org/news/experts-call-greater-recognition-software-source-code-heritage-sustainable-development][40 international experts meet in Paris]] ...
+    #+BEAMER: \pause
+*** :B_column:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: .5
+    :BEAMER_env: column
+    :END:
+    #+ATTR_LATEX: :width .65\linewidth
+    file:paris_call_ssc_cover.jpg
+    [[https://en.unesco.org/foss/paris-call-software-source-code][Their call is published on Feb 2019]] \pause
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** 
+    It's an important /policy tool/, already referenced and used ...
+    \hfill /yes, you can sign it!/\\
+    \vspace{10pt}
+   \hfill https://en.unesco.org/foss/paris-call-software-source-code \hfill\mbox{}
+    :PROPERTIES:
+    :BEAMER_COL: 1.06
+    :BEAMER_env: block
+    :END:
+* Breaking news
+** Archiving /public/ code
+   #+latex: \begin{center}
+   #+ATTR_LATEX: :width 0.7\linewidth
+   file:codeetalab.png
+   #+latex: \end{center}
+#+BEAMER: \pause
+   https://code.etalab.gouv.fr
+** ENEA mirror
+*** Thomas Jefferson, February 18, 1791 :B_block:
+    :PROPERTIES:
+    :BEAMER_ACT:
+    :BEAMER_env: block
+    :END:      
+#+latex:  {\em
+  ...let us save what remains: not by vaults and locks which fence them
+  from the public eye and use in consigning them to the waste of time,
+  but by such a multiplication of copies, as shall place them beyond
+  the reach of accident.
+#+latex: }
+   #+BEAMER: \pause
+*** Welcoming ENEA                                                  :B_block:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=LogoENEAcompletoENG.png, leftpic=true, width=.7\linewidth
+    :END:
+     - first *institutional* mirror
+     - increased resilience
+     - *AI infrastructure* for researchers
+     - stepping stone to \endgraf
+       \hfill an European joint effort
+** The Software Heritage Acquisition Process (SWHAP)
+*** Paris Call on Software Source Code
+    “[We call to] support efforts to gather and preserve the artifacts and
+    narratives of the history of computing, while the earlier creators are still
+    alive”
+#+BEAMER: \pause
+*** SWHAP : an important step forward
+     - detailed guidelines to *curate* landmark legacy source code
+       and *archive* it on Software Heritage
+     - intense cooperation with *Università di Pisa* and *UNESCO*
+     - open to all, we'll promote it worldwide
+*** 
+    https://www.softwareheritage.org/swhap
+* A bit of tech info
+** A peek under the hood                                          :maybemove:
+    #+BEAMER: \begin{center}
+    #+BEAMER:   \mode<beamer>{\only<1>{\includegraphics[width=\extblockscale{1\textwidth}]{swh-dataflow-merkle-listers.pdf}}}
+    #+BEAMER:   \only<2-3>{\includegraphics[width=\extblockscale{1\textwidth}]{swh-dataflow-merkle.pdf}}
+    #+BEAMER: \end{center}
+#+BEAMER: \pause
+#+BEAMER: \pause
+   /Global development history/ permanently archived in a /unique/ git-like Merkle DAG
+   - *~400 TB* (uncompressed) blobs, *~20 B* nodes, *~280 B* edges
+   #   - *GitHub*, Gitlab.com, Bitbucket, /Gitorious/, /GoogleCode/, GNU, PyPi, Debian, NPM...
+** Today: joining forces with GitHub                               :noexport:
+*** Paris Call on Software Source Code\hfill UNESCO, February 2019
+    [We call to] support: 
+    - “efforts to gather and preserve the artifacts and narratives of the history of computing,
+       while the earlier creators are still alive”
+    - “a universal archive, as part of a broad effort at digital preservation, that will
+       ensure persistence of and universal access to software source code”
+#+BEAMER: \pause
+*** Support SWH Acquisition Process                                 :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .45
+    :END:
+    #+ATTR_LATEX: :width .56\linewidth
+    file:SWHAP.png
+    # - SWH with UNESCO support
+    # - GitHub: handle /old dates/
+    \vspace{-0.2cm}
+    \tiny \mbox{}\hfill https://www.softwareheritage.org/swhap
+#+BEAMER: \pause
+*** Better GitHub archival in SWH                                   :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .45
+    :END:
+    #+ATTR_LATEX: :width .9\linewidth
+    file:GitHub-SWH-archive.png
+    # - improve archival
+    # - support effort
+** You can help!                                                   :noexport:
+*** Collect :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - /save source code now/!
+    - help build a /shared process/
+    - bootstrap the /focused search/
+*** Preserve :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - host /ancillary material/
+    - join /the SWH Foundation/
+    - become a /mirror/
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Share :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - build /on top of/ SWH
+*** Connect :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .5
+    :END:
+    - emulation, binaries, metadata, etc...
+*** Awareness
+    - leverage the [[https://en.unesco.org/foss/paris-call-software-source-code][Paris Call on Software Source Code]] (Unesco)
+* The SWH-ID: the source code fingerprint                          :noexport:
+** The SWH-ID schema
+  # TODO: drawing with swh:1:cnt:xxxxxxx "exploded" and explained
+  #+LATEX: \centering\forcebeamerstart
+  #+LATEX: \only<1>{\includegraphics[width=\linewidth]{SWH-ID-1.png}}
+  #+LATEX: \only<2>{\includegraphics[width=\linewidth]{SWH-ID-2.png}}
+  #+LATEX: \only<3>{\includegraphics[width=\linewidth]{SWH-ID-3.png}}
+  #+LATEX: \forcebeamerend
+** A worked example
+  #+LATEX: \centering\forcebeamerstart
+  #+LATEX: \only<1>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_1.pdf}}}
+  #+LATEX: \only<2>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/contents.pdf}}}
+  #+LATEX: \only<3>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_2_contents.pdf}}}
+  #+LATEX: \only<4>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/directories.pdf}}}
+  #+LATEX: \only<5>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_3_directories.pdf}}}
+  #+LATEX: \only<6>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/revisions.pdf}}}
+  #+LATEX: \only<7>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_4_revisions.pdf}}}
+  #+LATEX: \only<8>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/releases.pdf}}}
+  #+LATEX: \only<9>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/merkle_5_releases.pdf}}}
+  #+LATEX: \only<10>{\colorbox{white}{\includegraphics[width=\extblockscale{\linewidth}]{git-merkle/snapshots.pdf}}}
+  #+LATEX: \forcebeamerend
+** The Software Heritage ID schema \hfill (see *\url{http://bit.ly/swhpids}*)
+#+BEGIN_EXPORT latex
+\small
+\begin{tcolorbox}
+\href{https://archive.softwareheritage.org/swh:1:cnt:94a9ed024d3859793618152ea559a168bbcbb5e2}
+{swh:1:{\bf cnt}:94a9ed024d3859793618152ea559a168bbcbb5e2} \hfill full text of the GPL3 license
+\end{tcolorbox}
+\pause
+\begin{tcolorbox}
+\href{https://archive.softwareheritage.org/swh:1:dir:d198bc9d7a6bcf6db04f476d29314f157507d505}
+{swh:1:{\bf dir}:d198bc9d7a6bcf6db04f476d29314f157507d505} \hfill Darktable source code
+\end{tcolorbox}
+\pause
+\begin{tcolorbox}
+\href{https://archive.softwareheritage.org/swh:1:rev:309cf2674ee7a0749978cf8265ab91a60aea0f7d}
+{swh:1:{\bf rev}:309cf2674ee7a0749978cf8265ab91a60aea0f7d}
+\end{tcolorbox}
+\hfill a {\bf revision} in the development history of Darktable\\\pause
+\begin{tcolorbox}
+\href{https://archive.softwareheritage.org/swh:1:rel:22ece559cc7cc2364edc5e5593d63ae8bd229f9f}
+{swh:1:{\bf rel}:22ece559cc7cc2364edc5e5593d63ae8bd229f9f}
+\end{tcolorbox}
+\hfill {\bf release} 2.3.0 of Darktable, dated 24 December 2016\\\pause
+\begin{tcolorbox}
+\href{https://archive.softwareheritage.org/swh:1:snp:c7c108084bc0bf3d81436bf980b46e98bd338453}
+{swh:1:{\bf snp}:c7c108084bc0bf3d81436bf980b46e98bd338453}
+\end{tcolorbox}
+\hfill a {\bf snapshot} of the entire Darktable repository (4 May 2017, GitHub)
+#+END_EXPORT
+#+LATEX: \pause
+*** 
+   *Current resolvers:* \url{archive.softwareheritage.org} and \url{n2t.org}
+* The way forward
+** An international, non profit initiative\hfill built for the long term
+  :PROPERTIES:
+  :CUSTOM_ID: support
+  :END:
+*** Sharing the vision                                              :B_block:
+  :PROPERTIES:
+  :CUSTOM_ID: endorsement
+  :BEAMER_COL: .5
+  :BEAMER_env: block
+  :END:
+   #+LATEX: \begin{center}{\includegraphics[width=\extblockscale{.4\linewidth}]{unesco_logo_en_285}}\end{center}
+   #+LATEX: \vspace{-0.8cm}
+   #+LATEX: \begin{center}\vskip 1em \includegraphics[width=\extblockscale{1.4\linewidth}]{support.pdf}\end{center}
+    #+latex: \small And many more ...\\
+    #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/testimonials}
+*** Donors, members, sponsors                                       :B_block:
+    :PROPERTIES:
+    :CUSTOM_ID: sponsors
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+   #+LATEX: \begin{center}\includegraphics[width=\extblockscale{.4\linewidth}]{inria-logo-new}\end{center}
+   #+LATEX: \begin{center}
+   # #+LATEX: \includegraphics[width=\extblockscale{.2\linewidth}]{sponsors-levels.pdf}
+   #+LATEX: \colorbox{white}{\includegraphics[width=\extblockscale{1.4\linewidth}]{sponsors.pdf}}
+   #+LATEX: \end{center}
+#   - sponsoring / partnership :: \hfill \url{sponsorship.softwareheritage.org}
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Research collaboration                              :B_picblock:noexport:
+  :PROPERTIES:
+  :BEAMER_COL: .5
+  :BEAMER_env: picblock
+  :BEAMER_OPT: pic=Qwant_Logo, leftpic=true
+  :END:
+    source code search engine
+*** See more                                                       :noexport:
+    \hfill\tiny\url{http:://www.softwareheritage.org/support/testimonials}
+*** Global network                                      :B_picblock:noexport:
+    :PROPERTIES:
+    :BEAMER_COL: .5
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=fossid, leftpic=true, width=.3\linewidth
+    :END:
+     - first *independent mirror*
+     - increased reliability
+** CNRS and Software Heritage Working together
+*** Resources
+    - as a top SWH sponsor, contribute to the roadmap
+      + funding (see https://sponsors.softwareheritage.org)
+      + compute and storage infrastructure
+      + engineers and researchers
+*** Collaboration
+    - training and adoption
+      + across disciplines
+      + at the international level 
+    - strengthen SWH interoperability with HAL
+*** Strategy
+    - work together to establish an international infrastructure
+#    - (multi)disciplinary research on SWH
+** Come in, we're open!
+#+BEGIN_EXPORT latex
+% \begin{center}
+% \includegraphics[width=.5\linewidth]{SWH-logo.pdf}
+% \end{center}
+% \begin{center}
+% {\large \url{www.softwareheritage.org} \hspace{4em} \url{@swheritage}}
+% \end{center}
+#+END_EXPORT
+*** Library of Alexandria of code                       :B_picblock:noexport:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_COL: 0.4
+    :BEAMER_OPT: pic=clock-spring-forward.png,width=.45\linewidth,leftpic=true
+    :END:
+    Working together to
+    - recover the past
+    - preserve our heritage
+    - share the knowledge
+    - prepare the future
+*** Library of Alexandria of code                          :B_block:noexport:
+    :PROPERTIES:
+    :BEAMER_COL: 0.42
+    :BEAMER_env: block
+    :END:
+    \begin{center}\includegraphics[width=.4\linewidth]{clock-spring-forward.png}\end{center}
+    - recover the past
+    - structure the future
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+  #+BEGIN_EXPORT latex
+  \vfill
+  \begin{center}\Large Questions?\end{center}
+  \vfill
+  #+END_EXPORT
+*** Learn more \hfill www.softwareheritage.org/publications         :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :END:
+  #+BEGIN_EXPORT latex
+  \begin{thebibliography}{Foo Bar, 1969}
+  \footnotesize
+
+  \bibitem{ARSCSWH} Roberto Di Cosmo. \emph{Archiving and referencing source code with Software Heritage}\newblock
+  ICMS 2020, preprint: hal-02526083
+
+  \bibitem{Abramatic2018} Jean-François Abramatic, Roberto Di Cosmo, Stefano Zacchiroli\newblock
+  \emph{Building the Universal Archive of Source Code}, Communications of the ACM, October 2018
+
+  \bibitem{DiCosmo2020} P. Alliez, R. Di Cosmo, B. Guedj, A. Girault, M. Hacid, A. Legrand, N. Rougier\newblock
+  \emph{Attributing and Referencing (Research) Software: Best Practices and Outlook From Inria},
+  Computing in Science \& Engineering, 22 (1), pp. 39-52, 2020, ISSN: 1558-366X
+
+  \bibitem{DiCosmo2020} Roberto Di Cosmo, Morane Gruenpeter, Stefano Zacchiroli\newblock
+  \emph{Referencing Source Code Artifacts: a Separate Concern in Software Citation},
+  Computing in Science \& Engineering, 2020, ISSN: 1521-9615
+
+  \bibitem{OCamlP3l}  Roberto Di Cosmo, Marco Danelutto\newblock
+  \emph{[Rp] Reproducing and replicating the OCamlP3l experiment}. ReScience C, 6(1), 2.
+
+  \end{thebibliography}
+  #+END_EXPORT
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+*** Come in, we're open                                            :noexport:
+    \hfill  https://sponsorship.softwarheritage.org
diff --git a/talks-public/2020-07-OpenScience/Makefile b/talks-public/2020-07-OpenScience/Makefile
new file mode 100644
index 0000000..68fbee7
--- /dev/null
+++ b/talks-public/2020-07-OpenScience/Makefile
@@ -0,0 +1 @@
+include ../Makefile.slides