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+#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
+#+TITLE: Archive and Reference research source code
+#+SUBTITLE: a stepping stone for reproducibility
+# #+AUTHOR: Roberto Di Cosmo
+# #+EMAIL: roberto@dicosmo.org @rdicosmo @swheritage
+#+BEAMER_HEADER: \date[10/05/2021]{Journée reproductibilité \includegraphics[width=0.15\textwidth]{LogoSIF.jpg}}
+#+BEAMER_HEADER: \title[Software Heritage~~~~ www.softwareheritage.org]{Software Heritage: building the software pillar of Open Science}
+#+BEAMER_HEADER: \author[R. Di Cosmo~~~~ roberto@dicosmo.org ~~~~ (CC-BY 4.0)]{Roberto Di Cosmo\\Inria and Universit\'e de Paris\vspace{-2em}}
+# #+BEAMER_HEADER: \setbeameroption{show notes on second screen}
+#+BEAMER_HEADER: \setbeameroption{hide notes}
+#+KEYWORDS: software heritage legacy preservation knowledge mankind technology
+#+LATEX_HEADER: \usepackage{tcolorbox}
+#+LATEX_HEADER: \definecolor{links}{HTML}{2A1B81}
+#+LATEX_HEADER: \hypersetup{colorlinks,linkcolor=,urlcolor=links}
+
+#
+# prelude.org contains all the information needed to export the main beamer latex source
+# use prelude-toc.org to get the table of contents
+#
+
+#+INCLUDE: "../../common/modules/prelude-toc.org" :minlevel 1
+
+
+#+INCLUDE: "../../common/modules/169.org"
+
+# +LaTeX_CLASS_OPTIONS: [aspectratio=169,handout,xcolor=table]
+
+#+LATEX_HEADER: \usepackage{bbding}
+#+LATEX_HEADER: \DeclareUnicodeCharacter{66D}{\FiveStar}
+
+#
+# If you want to change the title logo it's here
+#
+# +BEAMER_HEADER: \titlegraphic{\includegraphics[width=0.5\textwidth]{SWH-logo}}
+
+# aspect ratio can be changed, but the slides need to be adapted
+# - compute a "resizing factor" for the images (macro for picblocks?)
+#
+# set the background image
+#
+# https://pacoup.com/2011/06/12/list-of-true-169-resolutions/
+#
+#+BEAMER_HEADER: \pgfdeclareimage[height=90mm,width=160mm]{bgd}{swh-world-169.png}
+#+BEAMER_HEADER: \setbeamertemplate{background}{\pgfuseimage{bgd}}
+#+LATEX: \addtocounter{framenumber}{-1}
+* Introduction
+#+INCLUDE: "../../common/modules/rdc-bio.org::#main" :only-contents t :minlevel 2
+* Software Source Code is Knowledge
+** Why Software /Source Code/
+   #+INCLUDE: "../../common/modules/source-code-different-short.org::#softwareisdifferent" :only-contents t :minlevel 3
+** Source code is /special/ (software is /not/ data)
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swnotdata" :only-contents t :minlevel 3
+** Software Source code: a pillar of Open Science
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#pillaropensciencecompact" :only-contents t :minlevel 3
+** What is at stake: ARDC \hfill in increasing order of difficulty
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#ardc" :only-contents t :minlevel 3
+*** :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+\vspace{-.5em}
+#+BEAMER: \pause
+**** 
+    We need an infrastructure /designed for/ software source code: \pause \hfill /now we have one!/
+* Meet Software Heritage
+** Software Heritage in a nutshell \hfill www.softwareheritage.org
+#+BEAMER: \transdissolve
+#+INCLUDE: "../../common/modules/swh-goals-oneslide-vertical.org::#goals" :only-contents t :minlevel 3
+** The largest software archive, a 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:2021-01-archive-growth.png
+** Addressing the four needs (see [[https://dx.doi.org/10.1007/978-3-030-52200-1_36][ICMS 2020]] for details)
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swh-ardc-short" :only-contents t :minlevel 3
+* Demo time!
+** Focus on Archive and Reference
+   - Browse [[https://archive.softwareheritage.org][the archive]]
+   - [[https://save.softwareheritage.org][Trigger archival]] of your preferred software in a breeze
+   - Get and use SWHIDs ([[https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html][full specification available online]])
+   - 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
+   - 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: extensive use of SWHIDs in [[https://www.dicosmo.org/Articles/2020-ReScienceC.pdf][a replication experiment]]
+   - Example in a real journal: [[http://www.ipol.im/pub/art/2020/300/][an article from IPOL]]
+   - Supporting reproducible builds: [[https://www.softwareheritage.org/2019/04/18/software-heritage-and-gnu-guix-join-forces-to-enable-long-term-reproducibility/][Guix]] and [[https://www.softwareheritage.org/2019/04/18/software-heritage-and-gnu-guix-join-forces-to-enable-long-term-reproducibility/][Nix]]
+** Recent news, and a lesson to be learned
+*** Saving 250.000 endangered repositories...
+    - summer 2019: BitBucket announce Mercurial VCS phase out
+    - fall 2019: Software Heritage teams up with Octobus (funded by NLNet, thanks!)
+    - july 2020: BitBucket erases /250.000/ repositories
+    - august 2020: [[https://bitbucket-archive.softwareheritage.org][bitbucket-archive.softwareheritage.org]] is live
+#+BEAMER: \pause
+*** ... preserving the web of knowledge   \hfill  (Tweet [[https://twitter.com/gabrielaltay/status/1300218789762662401][is here]] ) :B_picblock:
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=bitbucket_swh_praise.png, width=.6\linewidth, leftpic=true
+    :END:
+
+\\
+    *Bottomline*\\
+    /explicit deposit/ is important, ...\\
+    \mbox{}\hfill ... and we must promote it...\hfill\mbox{}\\
+    \mbox{}\hfill ... but will never be enough.\\
+\mbox{}\\
+\mbox{}\hfill /(think also of all software dependencies!)/
+* The road ahead
+** Summing up: a revolutionary infrastructure /designed for source code/
+#+latex:\vspace{-0.2em}
+#+BEGIN_EXPORT latex
+ \begin{center}
+ \includegraphics[width=.4\linewidth]{SWH-logo.pdf}
+ { \url{www.softwareheritage.org}}
+ \end{center}
+#+END_EXPORT
+#+latex:\vspace{-0.4em}
+*** /global/ source code /archive/ \hfill /Library of Alexandria of source code/
+    :PROPERTIES:
+    :BEAMER_env: picblock
+    :BEAMER_OPT: pic=clock-spring-forward.png,width=.15\linewidth,leftpic=true
+    :END:
+      + harvest /all/ software, not just research software
+      + /on demand harvesting/ and /curated deposit/
+#+latex:\vspace{-0.4em}
+*** /universal/ intrinsic identifiers
+      \mbox{}\hfill SWHID standard is independent of version control systems
+#+latex:\vspace{-0.4em}
+*** /uniform/ data model, /full graph/ of development history
+      \mbox{}\hfill enables large scale, big code research
+#+BEAMER: \pause
+#+latex:\vspace{-0.4em}
+*** /infrastructure/ for Open Science
+    \mbox{} \hfill /base layer/ for software source code in the /Open Science architecture/
+** 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}
+#+BEAMER: \pause
+*** 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
+** Growing adoption in Academia (selection)
+   #+INCLUDE: "../../common/modules/swh-adoption-academic.org::#adoption" :only-contents t :minlevel 3   
+** You may help!
+*** Foster adoption and best practices
+      + [[https://www.softwareheritage.org/save-and-reference-research-software/][archive and reference your source code]], cite using [[https://ctan.org/pkg/biblatex-software][biblatex-software]]
+      + [[https://hal.inria.fr/hal-01872189][describe and deposit via HAL]] (see Morane Gruenpeter's talk later today)
+      + ask journals and conferences to use Software Heritage (like IPOL, etc.)
+#+BEAMER: \pause
+*** Engage with Software Heritage as an individual
+    - the [[https://www.softwareheritage.org/ambassadors/][ambassador program]] is open:
+      + learn directly from the core team, share with your research community
+    - (small) [[https://www.softwareheritage.org/grants/][grants are available]] to expand the coverage of the archive
+#+BEAMER: \pause
+*** Engage with Software Heritage as an organization
+    - join [[https://www.softwareheritage.org/support/sponsors/][as a member/sponsor]]
+    - establish a [[https://www.softwareheritage.org/mirrors/][mirror]] (see e.g. ENEA): support the mission and enable Big Code
+** Thank you!
+   #+latex:    \centering{\huge\bf Questions?}
+  \vspace{-.5em}  
+*** References
+  #+BEGIN_EXPORT latex
+  \begin{thebibliography}{Foo Bar, 1969}
+  \footnotesize
+  \bibitem{SwForumEu2021} R. Di Cosmo, \emph{A revolutionary infrastructure for Open Source}, 2021, EU Software Forum \href{https://annex.softwareheritage.org/public/talks/2021/2021-03-24-SwForum.pdf}{(slides)} \href{https://youtu.be/AwY527kDMfM?t=178}{(video)}
+  \bibitem{EOSCSirs2020} EOSC SIRS Task Force, \emph{Scholarly Infrastructures for Research Software}
+  \newblock 2020, European Commission, \href{https://doi.org/10.2777/28598}{(10.2777/28598)}
+  \bibitem{DiCosmo2020d} R. Di Cosmo, \emph{Archiving and Referencing Source Code with Software Heritage}
+  \newblock ICMS 2020 \href{https://dx.doi.org/10.1007/978-3-030-52200-1_36}{(10.1007/978-3-030-52200-1\_36)}
+  \bibitem{DiCosmo2019} R. Di Cosmo, M. Gruenpeter, S. 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} P. Alliez, R. Di Cosmo, B. Guedj, A. Girault, M.-S. Hacid, A. Legrand and N. 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)}
+  \bibitem{Abramatic2018} J.F. Abramatic, R. Di Cosmo, S. Zacchiroli,
+  \emph{Building the Universal Archive of Source Code}, 
+  \newblock CACM, October 2018 \href{https://doi.org/10.1145/3183558}{(10.1145/3183558)}
+  \end{thebibliography}
+  #+END_EXPORT
+* Appendix :B_appendix:
+  :PROPERTIES:
+  :BEAMER_env: appendix
+  :END:
+** 
+   \vfill
+   \centerline{\Huge Appendix}
+   \vfill
+* SWHIDs by the example
+** A word on the trust model for systems of identifiers
+   \vspace{-5pt}
+*** Two general classes of systems of identifiers
+    - intrinsic :: /computed/ from the object /(no registry required, fully decentralised)/\\
+      /(e.g.: chemical notation, music notation, hashes, SWHIDs)/\pause
+    - extrinsic :: /assigned/ by an authority /(need a registry)/\\
+      /(e.g.: passport number, DOI, ARK, RRID, etc.)/\pause
+    \mbox{}\hfill See [[https://www.softwareheritage.org/2020/07/09/intrinsic-vs-extrinsic-identifiers/][the dedicated blog post]] for more details 
+#+BEAMER: \pause
+*** Trust model, extrinsic (e.g. DOIs)                              :B_block:
+    :PROPERTIES:
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+#+ATTR_LATEX: :width \linewidth
+file:doi-vs-pid-1.pdf
+#+BEAMER: \pause
+*** Trust model, intrinsic (e.g. SWHIDs)                            :B_block:
+    :PROPERTIES:
+    :BEAMER_env: block
+    :BEAMER_COL: .45
+    :END:
+#+ATTR_LATEX: :width .8\linewidth
+file:doi-vs-pid-3.pdf
+*** Trust model for DOIs with checksums                    :B_block:noexport:
+    :PROPERTIES:
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+#+ATTR_LATEX: :width \linewidth
+file:doi-vs-pid-2.pdf
+***                                                :B_ignoreheading:noexport:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+** Software Heritage Identifiers (SWHID) \hfill [[https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html][link to full docs]]
+# #+INCLUDE: "../../common/modules/swh-id-syntax.org::#swh-id-syntax" :only-contents t :minlevel 3
+  #+LATEX: \centering%\forcebeamerstart
+  #+LATEX: \mode<beamer>{\only<1>{\includegraphics[width=\linewidth]{SWHID-v1.4_1.png}}}
+  #+LATEX: \mode<beamer>{\only<2>{\includegraphics[width=\linewidth]{SWHID-v1.4_2.png}}}
+  #+LATEX: \only<3->{\includegraphics[width=\linewidth]{SWHID-v1.4_3.png}}
+  #+LATEX: %\forcebeamerend
+*** An emerging standard :B_block:
+    :PROPERTIES:
+    :BEAMER_act: <4->
+    :BEAMER_COL: .6
+    :BEAMER_env: block
+    :END:
+    - in Linux Foundation's [[https://spdx.github.io/spdx-spec/appendix-VI-external-repository-identifiers/#persistent-id][SPDX 2.2]]
+    - IANA registered, WikiData property [[https://www.wikidata.org/wiki/Property:P6138][P6138]]
+*** Examples: :B_block:
+    :PROPERTIES:
+    :BEAMER_act: <5->
+    :BEAMER_COL: .4
+    :BEAMER_env: block
+    :END:
+    - [[https://archive.softwareheritage.org/swh:1:cnt:64582b78792cd6c2d67d35da5a11bb80886a6409;origin=https://github.com/virtualagc/virtualagc;lines=245-261/][Apollo 11 AGC excerpt]],
+    - [[https://archive.softwareheritage.org/swh:1:cnt:bb0faf6919fc60636b2696f32ec9b3c2adb247fe;origin=https://github.com/id-Software/Quake-III-Arena;lines=549-572/][Quake III rsqrt]]
+
+** 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
+* Big code
+** Software Heritage for Research and Innovation
+*** Reference platform for /Big Code/                            :B_picblock:
+    :PROPERTIES:
+    :BEAMER_opt: pic=universal, leftpic=true, width=.2\linewidth
+    :BEAMER_env: picblock
+    :BEAMER_act:
+    :END:
+   - unique *observatory* of all software development 
+   - *big data, machine learning* paradise: classification, trends, coding patterns, code completion...
+#+BEAMER: \pause
+*** First datasets are available!
+   - full graph of software development (~20Bn nodes, ~200Bn edges)
+     see Pietri, Spinellis, Zacchiroli, MSR 2019 https://dx.doi.org/10.1109/MSR.2019.00030
+   - MSR 2020 mining competition
+     see https://2020.msrconf.org/track/msr-2020-mining-challenge#Call-for-Papers
+
+* News
+** Milestones                                                      :noexport:
+   #+INCLUDE: "../../common/modules/swh-key-dates.org::#keydates" :minlevel 3 :only-contents t
+** News : 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
+** 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
+** News : 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
diff --git a/talks-public/2021-05-10-SIF/METADATA b/talks-public/2021-05-10-SIF/METADATA
new file mode 100644
index 0000000..85a6f33
--- /dev/null
+++ b/talks-public/2021-05-10-SIF/METADATA
@@ -0,0 +1,2 @@
+Title: Archiver et référencer le code source des logiciels de recherche pour la Science Ouverte et la Reproductibilité, Roberto di Cosmo, IRIF, Université Paris Diderot et INRIA.
+Abstract: Le logiciel est un pilier fondamental de la recherche scientifique moderne, et il est primordial d’archiver et de référencer correctement les code source du logiciel utilisé dans toutes les activités de recherche. Dans cette présentation, nous montrerons comment utiliser l’infrastructure Software Heritage pour archiver de façon transparente tous le code source des logiciels et comment obtenir et utiliser les identifiants intrinsèques, spécialement conçus pour le code source des logiciels, qui sont nécessaires pour référencer le code source d’une manière qui facilite la reproductibilité à long terme. Des pointeurs vers des guides détaillés seront fournis.
diff --git a/talks-public/2021-05-10-SIF/Makefile b/talks-public/2021-05-10-SIF/Makefile
new file mode 100644
index 0000000..68fbee7
--- /dev/null
+++ b/talks-public/2021-05-10-SIF/Makefile
@@ -0,0 +1 @@
+include ../Makefile.slides