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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: Software Heritage
+#+SUBTITLE: Une infrastructure universelle pour archiver, référencer et citer les codes source
+#+DATE: 09/11/2021
+# #+AUTHOR: Roberto Di Cosmo
+# #+EMAIL: roberto@dicosmo.org @rdicosmo @swheritage
+#+BEAMER_HEADER: \date[2/12/2021, \#SWH5YEARS]{2 December 2021\\Journées 3D SHS \#SWH5YEARS \\[-2ex]}
+#+BEAMER_HEADER: \title[Software Heritage~~~softwareheritage.org]{Software Heritage}
+#+BEAMER_HEADER: \institute[Software Heritage]{Director, Software Heritage\\Inria and Universit\'e de Paris}
+#+BEAMER_HEADER: \author[R. Di Cosmo~~~~ roberto@dicosmo.org ~~~~ @rdicosmo ~~~~ (CC-BY 4.0)]{Roberto Di Cosmo}
+# #+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)
+  # Was: #+INCLUDE: "../../common/modules/swh-ardc.org::#swnotdata" :only-contents t :minlevel 3
+*** /Executable/ and /human readable/ knowledge \hfill copyright law :noexport:
+    /“Programs must be written for people to read, and only incidentally for machines to execute.”/\\
+    \hfill Harold Abelson
+#+BEAMER: \pause
+*** 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
+      + /research software/ a thin top layer
+    - sophisticated /developer communities/
+***                                                         :B_ignoreheading:
+    :PROPERTIES:
+    :BEAMER_env: ignoreheading
+    :END:
+#+BEAMER: \pause
+*** The human side
+    design, algorithm, code, test, documentation, community, funding\\
+    \hfill and so many more facets ...
+** Source code is /special/ (software is /not/ data)               :noexport:
+   #+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
+** Our principles \hfill iPres 2017 - \url{http://bit.ly/swhpaper}
+  :PROPERTIES:
+  :CUSTOM_ID: principles
+  :END:
+#+latex: \begin{center}
+#+ATTR_LATEX: :width .7\linewidth
+file:SWH-as-foundation-slim.png
+#+latex: \end{center}
+#+BEAMER: \pause
+*** Open approach                                             :B_block:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: 0.3
+    :BEAMER_env: block
+    :END:
+  - Transparency
+  - Free Software
+  - User and contributor community building
+*** Objectivity                                               :B_block:BMCOL:
+    :PROPERTIES:
+    :BEAMER_opt:
+    :BEAMER_env: block
+    :BEAMER_col: 0.3
+    :END:
+  - Facts and provenance
+  - /Intrinsic/ identifiers
+  - Full development history
+*** Long term                                                 :B_block:BMCOL:
+    :PROPERTIES:
+    :BEAMER_col: 0.3
+    :BEAMER_env: block
+    :END:
+  - Multi-stakeholder
+  - Nonprofit
+  - Replication /at all layers/
+** The Software Heritage archive today
+   #+INCLUDE: "../../common/modules/status-extended.org::#archive" :only-contents t :minlevel 3
+** The largest software archive, a shared infrastructure           :noexport:
+   #+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:2021-09-archive-growth.png
+** A(rchive)
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swh-a" :only-contents t :minlevel 3
+** R(eference): granularity and identifiers \hfill [[http://doi.org/10.15497/RDA00053][10.15497/RDA00053]]
+  #+LATEX: \centering\forcebeamerstart
+  #+LATEX: \only<1>{\includegraphics[width=0.8\linewidth]{Granularity-Level-animated-0.png}}
+  #+LATEX: \only<2>{\includegraphics[width=0.8\linewidth]{Granularity-Level-animated-1.png}}
+  #+LATEX: \only<3>{\includegraphics[width=0.8\linewidth]{Granularity-Level-animated-2.png}}
+  #+LATEX: \only<4>{\includegraphics[width=0.8\linewidth]{Granularity-Level-animated-3.png}}
+  #+LATEX: \forcebeamerend
+  #+LATEX: \only<1>{\begin{block}{}\centering Top concept layers vs. bottom artifact layers\end{block}}
+  #+LATEX: \only<2>{\begin{block}{}\centering Extrinsic identifiers are key for the concept layers\end{block}}
+  #+LATEX: \only<3>{\begin{block}{}\centering Intrinsic identifiers are key for the artifact layers\end{block}}
+  #+LATEX: \only<4>{\begin{block}{}\centering In some cases, extrinsic identifiers can be added too\end{block}}
+  
+** Extrinsic and Intrinsic identifiers in a nutshell
+*** Extrinsic identifiers: no /per se/ relation with the designated Object
+     A /register/ keeps the correspondence between the identifier and the object
+     - pre-internet era :: passport number, social security number, ISBN, ISSN, etc.
+     - internet era :: DOI, Handle, Ark, PURLs, RRID, etc.\pause
+*** Intrinsic identifiers: derived from the designated Object
+   /No register/ needed to keep the correspondence between the identifier and the object
+   - pre-internet era :: musical notation, chemical notation (/NaCl/ is table salt)\pause
+   - internet era :: cryptographic hashes for distributed software development, Bitcoin\pause
+*** 
+   \hfill more in [[https://www.softwareheritage.org/2020/07/09/intrinsic-vs-extrinsic-identifiers/][this dedicated blog post]] (with pointers to literature)
+** Meet the Software Heritage Identifiers (SWHIDs) \hfill [[https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html][(full spec)]] :noexport:
+  #+INCLUDE: "../../common/modules/swhid.org::#oneslide" :only-contents t
+  for *20+ billions* software artifacts!
+** Meet the SWHID intrinsic identifiers
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swh-r" :only-contents t :minlevel 3
+** D(escribe) and C(redit/cite): HAL+SWH
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swh-dc" :only-contents t :minlevel 3
+** Addressing the four needs (see [[https://dx.doi.org/10.1007/978-3-030-52200-1_36][ICMS 2020]] for details)           :noexport:
+   #+INCLUDE: "../../common/modules/swh-ardc.org::#swh-ardc-short" :only-contents t :minlevel 3
+** Deposit research software \hfill /open since 9/2018/            
+   #+INCLUDE: "../../common/modules/swh-scientific-publishing.org::#hal" :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 HAL deposits: [[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]], ...
+   - Cite software [[https://www.softwareheritage.org/2020/05/26/citing-software-with-style/][with the biblatex-software style]] from CTAN
+   - Example in a real journal: [[http://www.ipol.im/pub/art/2020/300/][an article from IPOL]]
+   - 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]]
+   - 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]]
+** Summing up: a revolutionary infrastructure /designed for source code/ :noexport:
+#+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/
+* The road ahead
+** 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   
+** Focus: the EOSC SIRS report                                     :noexport:
+   #+INCLUDE: "../../common/modules/policyactions.org::#eoscsirs2020" :only-contents t :minlevel 3
+** Focus: second French National Plan for Open Science
+   #+INCLUDE: "../../common/modules/policyactions.org::#pnso2" :only-contents t :minlevel 3
+** You may help!
+#+BEAMER: \vspace{-0.5em}
+*** Foster adoption and best practices for researchers \hfill training sessions
+      + [[https://hal.inria.fr/hal-01872189][describe and deposit via HAL]], train HAL moderators to handle software
+      + [[https://www.softwareheritage.org/save-and-reference-research-software/][archive and reference source code]], cite using [[https://ctan.org/pkg/biblatex-software][biblatex-software]]
+      + ask journals to adopt Software Heritage (like IPOL, etc.)
+      + join the software working group of the CoSO
+#+BEAMER: \pause
+#+BEAMER: \vspace{-0.5em}
+*** Engage with Software Heritage: individuals \hfill communication
+    - join the Software Heritage [[https://www.softwareheritage.org/ambassadors/][ambassador program]]
+    - share best practices in the disciplinary community
+#      + learn directly from the core team, share with your community
+#    - (small) [[https://www.softwareheritage.org/grants/][grants are available]] to expand the coverage of the archive
+#+BEAMER: \pause
+#+BEAMER: \vspace{-0.5em}
+*** Engage with Software Heritage: organization \hfill collaboration
+    - include software in your /Open Science policy/
+    - join [[https://www.softwareheritage.org/support/sponsors/][as a member/sponsor]] (thanks to Sorbonne Université: member since 2020)
+    - contribute to build a global software catalog
+#    - 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{PNSO2} MESRI, \emph{Plan National pour la Science Ouverte}
+  \newblock 2021,   \href{https://www.enseignementsup-recherche.gouv.fr/cid159131/le-plan-national-pour-la-science-ouverte-2021-2024-vers-une-generalisation-de-la-science-ouverte-en-france.html}{(official announcement)}
+  \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:noexport:
+  :PROPERTIES:
+  :BEAMER_env: appendix
+  :END:
+** 
+   \vfill
+   \centerline{\Huge Appendix}
+   \vfill
+* SWHIDs by the example                                            :noexport:
+** 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                                                         :noexport:
+** 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                                                             :noexport:
+** 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!)/
+** 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/2021-12-02-3D-SHS/Makefile b/talks-public/2021-12-02-3D-SHS/Makefile
new file mode 100644
index 0000000..68fbee7
--- /dev/null
+++ b/talks-public/2021-12-02-3D-SHS/Makefile
@@ -0,0 +1 @@
+include ../Makefile.slides