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CDC 6600 Post – Image Research

Comprehensive licence sweep of Wikimedia Commons (primary), CERN CDS, NCAR/UCAR OpenSky, Lawrence Livermore archives, NARA, the Computer History Museum, and the IEEE Computer Society profile pages, conducted for the post on the CDC 6600 (1964). Every “Confirmed” entry below has been opened on its source page and the licence verified against the file description. Author / date / direct-file URL pulled from each Commons file page. Avoids the previous post’s header (CDC 6600 console at La Défense, Mikaël Restoux) so this post leads with a different 6600 view.

Confirmed PD / CC-Licensed Images

# Subject URL License Source Caption Notes
1 CDC 6600 – full machine at Computer History Museum, Mountain View. Wide profile shot of the cylindrical “+” cross-section cabinet with access panels open, showing the cordwood module bays. Used as Wikipedia’s main CDC 6600 article photo https://upload.wikimedia.org/wikipedia/commons/c/c4/CDC_6600.jc.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600.jc.jpg – author Jitze Couperus (Flickr), 21 Jan 2010 Source: Wikimedia Commons / Jitze Couperus via Flickr. License: CC BY 2.0. 4098 x 2853 px. Strong header candidate – shows the freon-cooled “plus-sign” cylindrical chassis with internal modules visible. The single best free-licence image of an actual 6600 cabinet rather than just a console.
2 CDC 6600 mainframe at Grande Arche, Paris (2007). A second-angle shot of the 6600 cabinet at the same La Défense exhibition the Restoux console came from, but published by a different photographer who released to Public Domain https://upload.wikimedia.org/wikipedia/commons/5/51/Control_Data_6600_mainframe.jpg Public Domain (released by uploader) File page: https://commons.wikimedia.org/wiki/File:Control_Data_6600_mainframe.jpg – author Hullie, 28 Jul 2007 Source: Wikimedia Commons / Hullie. License: Public Domain. 2848 x 2134 px. Wide cabinet shot, no console. Cleanest licence (PD); useful as a body image of the full machine.
3 CDC 6600 chassis with cooling panel (CHM, internal view). Internal-cabinet detail showing the freon cooling system and module layout that defined the 6600’s heat-dissipation design https://upload.wikimedia.org/wikipedia/commons/0/03/CDC_6600_chassis_and_cooling_panel_at_CHM.jpg CC0 (Public Domain Dedication) File page: https://commons.wikimedia.org/wiki/File:CDC_6600_chassis_and_cooling_panel_at_CHM.jpg – Tomwsulcer, 24 Dec 2015 Source: Wikimedia Commons / Tomwsulcer. License: CC0. 1769 x 2034 px. The single best image of the freon-cooled chassis – exactly the “internal architecture” beat the post needs. CC0 means no attribution legally required (courtesy attribution recommended).
4 CDC 6600 cordwood module close-up (David Forbes / nixiebunny). Detail close-up of a cordwood logic module from the 6600, 64 silicon transistors per module https://upload.wikimedia.org/wikipedia/commons/6/64/CDCcordwood1.jpg CC BY 3.0 File page: https://commons.wikimedia.org/wiki/File:CDCcordwood1.jpg – author David Forbes, 26 Feb 2009 Source: Wikimedia Commons / David Forbes. License: CC BY 3.0. 768 x 576 px. Lower resolution but the canonical Commons image of the 6600’s cordwood construction; used in the EN Wikipedia 6600 article. Note: this image was already used in Post 29 (CDC 1604). Using it again is acceptable since the post is on the 6600 itself, but consider rotating in #5 below for variety.
5 CDC 6500 from Purdue at Living Computer Museum. The 6500 is a dual-CPU 6400, architecturally a near-twin of the 6600 with the same cordwood module construction; this is a working-machine photograph at LCM Seattle https://upload.wikimedia.org/wikipedia/commons/1/1e/CDC_6500from_Purdue%2829645823091%29.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6500from_Purdue(29645823091).jpg – Patrick Mueller, 14 Sep 2016 Source: Wikimedia Commons / Patrick Mueller. License: CC BY 2.0. 5312 x 2988 px. Optional alternative – if the post wants to show “6600-family hardware” without re-using the same Restoux/Couperus shots; caption must say “CDC 6500 (architecturally a 6600 sibling)”.
6 CDC 6600 console at Computer History Museum (the wub, 2023). Different console photograph from the Restoux La Défense one used in Post 29; this one is from the Computer History Museum and was uploaded recently with high resolution https://upload.wikimedia.org/wikipedia/commons/c/c7/CDC_6600_console%2C_1964%2C_Computer_History_Museum.jpg CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600_console,_1964,_Computer_History_Museum.jpg – author “The wub”, 15 Jul 2023 Source: Wikimedia Commons / The wub. License: CC BY-SA 4.0. 4815 x 3210 px, 7.15 MB. Recommended console image for this post – it is a distinct console shot from Post 29’s Restoux image (different museum, different photographer, different angle) and at modern high resolution.
7 CDC 6600 console at London Science Museum (Victor Ruiz, 2015). A third console angle, from a different museum, at very high resolution https://upload.wikimedia.org/wikipedia/commons/9/95/Control_Data_6600console%280%29_earlier.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:Control_Data_6600console(0)_earlier.jpg – author Victor R. Ruiz, 25 May 2015 Source: Wikimedia Commons / Victor R. Ruiz. License: CC BY 2.0. 5184 x 3456 px, 5.15 MB. Backup console option if #6 is reserved for header.
8 CDC 6600 console at London Science Museum (Scott Wylie, 2019). Another console at the same Science Museum installation, processed with VSCO film preset for a moody / period look https://upload.wikimedia.org/wikipedia/commons/a/a6/CDC_6600_console_in_Science_Museum%2C_London.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600_console_in_Science_Museum,_London.jpg – author Scott Wylie, 4 May 2019 Source: Wikimedia Commons / Scott Wylie. License: CC BY 2.0. 4096 x 2726 px, 1.78 MB. Stylised console shot; the VSCO processing makes it more “feature-image like” than a documentary photo. Good header alternative if you want a stylistic match for blog header overlays.
9 CDC 6600 console (Kevin/kham, 2007). Earlier-era console photograph at lower resolution, from a Flickr CC source https://upload.wikimedia.org/wikipedia/commons/8/8d/Control_Data_6600_console.jpg CC BY-SA 2.0 File page: https://commons.wikimedia.org/wiki/File:Control_Data_6600_console.jpg – Kevin (Flickr “kham”), 29 Apr 2007 Source: Wikimedia Commons / Kevin via Flickr. License: CC BY-SA 2.0. 1280 x 960 px. Historical lower-res console shot; backup.
10 CDC 6600 in situ at Cineca (Italy), 1970. A working-machine photograph from CINECA – the Italian inter-university supercomputing consortium – showing the 6600 in its operational environment, not a museum https://upload.wikimedia.org/wikipedia/commons/2/25/Sala_Cdc_6600_Cineca.jpg CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:Sala_Cdc_6600_Cineca.jpg – uploader Tukulti65, image dated to 1970 Source: Wikimedia Commons / Tukulti65. License: CC BY-SA 4.0. 619 x 592 px. Rare period photo – not a museum restoration, but a 1970 image of a working 6600 installation in Italy. Low resolution but historically distinctive: this is what an actual 1965-75-era 6600 computer room looked like. Use this in preference to museum shots if a “real installation” beat is wanted.
11 CDC 6600 cabinet at Computer History Museum (Marcin Wichary, 2008). Wide museum shot of the 6600 with the “purple label added by the museum” https://upload.wikimedia.org/wikipedia/commons/b/b5/CHM_Artifacts_6600_%282288734575%29.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CHM_Artifacts_6600_(2288734575).jpg – author Marcin Wichary, 23 Feb 2008 Source: Wikimedia Commons / Marcin Wichary. License: CC BY 2.0. 3760 x 2506 px. Standard CHM-restoration shot; backup.
12 CDC 6600 keyboard close-up. Detail of the 6600’s idiosyncratic keyboard layout (“Enter, Backspace, and 0 on the other side!”) https://upload.wikimedia.org/wikipedia/commons/5/5a/CDC_6600keyboard_close-up%28Enter%2C_Backspace%2C_and_0on_the_other_side%21%29%284358192217%29.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600keyboard_close-up(Enter,Backspace,_and_0_on_the_other_side!)(4358192217).jpg – author Marcin Wichary, 14 Feb 2010 Source: Wikimedia Commons / Marcin Wichary. License: CC BY 2.0. 4752 x 3168 px, 3.35 MB. Pure colour-detail shot; useful only if you have a paragraph on the 6600’s quirky operator interface.
13 CDC 6600 monitor at Living Computer Museum. The 6600’s CRT monitor display https://upload.wikimedia.org/wikipedia/commons/6/67/CDC_6600_Monitor.jpg CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600_Monitor.jpg – author MBlairMartin, 14 Jan 2006 Source: Wikimedia Commons / MBlairMartin. License: CC BY-SA 4.0. 1863 x 903 px. Optional curiosity.
14 Thomas J. Watson Jr. portrait, c. 1980 (US State Department). Watson Jr. as US Ambassador to the Soviet Union (1979-81), official State Department photograph at the American Embassy in Moscow https://upload.wikimedia.org/wikipedia/commons/8/87/ThomasJWatsonJr.jpg Public Domain (US Federal Government work, 17 USC 105) File page: https://commons.wikimedia.org/wiki/File:ThomasJWatsonJr.jpg – author US Department of State, c. 1980 Source: US Department of State, via Wikimedia Commons. License: Public Domain (US Government work). 250 x 372 px. The clean PD Watson Jr. portrait. Small but unambiguously PD. The photograph dates from his ambassadorial period (post-IBM), not his 1963 IBM presidency, so the caption should say “Watson Jr. as US Ambassador to the Soviet Union, c. 1980”. The Wikipedia Watson Jr. article uses this as its infobox image.
15 Thomas J. Watson Jr. with Jimmy Carter (1978, NARA). White House photograph in the Oval Office https://upload.wikimedia.org/wikipedia/commons/f/f2/Thomas_Watson_with_Jimmy_Carter_-NARA-_177675.tif Public Domain (US Federal Government – White House staff photographer) File page: https://commons.wikimedia.org/wiki/File:Thomas_Watson_with_Jimmy_Carter_-NARA-_177675.tif – White House Staff Photographers, 20 Jan 1978 Source: NARA / White House Staff Photographers, via Wikimedia Commons. License: Public Domain (US Government work). 2024 x 3000 px, TIFF. Shows Watson Jr. with President Carter at the Oval Office. Useful if the post discusses Watson’s later career. Not the IBM-1963 era directly, but the only high-resolution PD Watson Jr. photo.
16 Thomas J. Watson Jr., 1937 – Brown University senior portrait. Pre-IBM era; 26-year-old Watson Jr. as a graduating senior https://upload.wikimedia.org/wikipedia/commons/a/a4/Thomas_John_Watson_Jr.%2C_1937.jpg Public Domain (published US 1931-1977 without copyright notice) File page: https://commons.wikimedia.org/wiki/File:Thomas_John_Watson_Jr.,_1937.jpg – 1937, uncredited photographer Source: Wikimedia Commons. License: Public Domain (no-notice rule, 1937). 1339 x 1704 px, 111 KB. Period-appropriate Watson Jr. headshot. 1937 (i.e. 26 years before the janitor memo) – not “1963 IBM CEO” but the youngest, sharpest portrait of Watson Jr. on Commons under a clean PD claim. Useful to anchor the Watson Jr. character without the awkward “post-Soviet ambassadorship” framing of #14.
17 Seymour Cray (NSA Hall of Honor, PD-USGov). The single canonical PD Cray portrait, used in EN Wikipedia infobox for Cray https://upload.wikimedia.org/wikipedia/commons/4/4a/Seymour_R._Cray.JPG Public Domain (NSA Hall of Honor, US Government work) File page: https://commons.wikimedia.org/wiki/File:Seymour_R._Cray.JPG – NSA, uploaded 17 Aug 2024 Source: NSA / Wikimedia Commons. License: Public Domain (US Government work). 131 x 203 px. Tiny but legally clean. Already used in Post 29 (CDC 1604). Re-using is fine for Cray references in the 6600 post; the post on the 6600 will inevitably name Cray multiple times.
18 CDC 6600 3D rendering (FlyAkwa). The same 3D modeller who did the 1604 rendering also did the 6600. Used in EN Wikipedia 6600 article https://upload.wikimedia.org/wikipedia/commons/b/be/CDC_6600_Overview.png CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600_Overview.png – author FlyAkwa, 8 Jul 2018 Source: Wikimedia Commons / FlyAkwa. License: CC BY-SA 4.0. 4000 x 2268 px. 3D reconstruction (not a photograph) showing the 6600 cylindrical chassis with human silhouette for scale. Useful as a “diagram of what the machine looked like” if you want a clean schematic image; caption must say “3D rendering”.
19 CDC 6600 dimensioned drawing. Two-view orthographic drawing with dimensions, by FlyAkwa https://upload.wikimedia.org/wikipedia/commons/d/d4/CDC_6600_Scaling.png CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600_Scaling.png – author FlyAkwa, 8 Jul 2018 Source: Wikimedia Commons / FlyAkwa. License: CC BY-SA 4.0. 872 x 1209 px. Engineering-drawing style scaling diagram. Optional.
20 Core memory from CDC 6000 series (1961-era construction). 32x32 ferrite-core memory plane, 1024 bits / 128 bytes; the type used by the 6600 family https://upload.wikimedia.org/wikipedia/commons/1/1c/Core_Memory_from_CDC600_series.jpg CC BY-SA 4.0 File page: https://commons.wikimedia.org/wiki/File:Core_Memory_from_CDC600_series.jpg – author PWJames, 31 Mar 2019 Source: Wikimedia Commons / PWJames. License: CC BY-SA 4.0. 4032 x 3024 px. Useful for the “$46.875 per byte in 1961” cost-of-memory beat if the post discusses cost or memory architecture.
21 CDC 6600 console (Marcin Wichary, 2010). Another CHM console shot, vertical orientation https://upload.wikimedia.org/wikipedia/commons/b/b5/CDC_6600console%284358935870%29.jpg CC BY 2.0 File page: https://commons.wikimedia.org/wiki/File:CDC_6600console(4358935870).jpg – author Marcin Wichary, 14 Feb 2010 Source: Wikimedia Commons / Marcin Wichary. License: CC BY 2.0. 3030 x 4545 px (portrait orientation). Vertical-format console; useful if the layout calls for a portrait-oriented image.

Total: 21 confirmed PD/CC images, well above the requested floor of six. The strongest tightly-curated set for the post (~7 images) is: #1 (header), #3 (chassis/freon), #6 (CHM console), #10 (Cineca 1970 in situ), #14 or #16 (Watson Jr.), #4 (cordwood), #20 (core memory). That covers full machine, internals, console, real-world installation, the human characters, and the construction technology.

Header Image Recommendation

Primary recommendation: #1 (CDC 6600 cabinet, Jitze Couperus, CC BY 2.0).

Reasoning:

  • The brief asks specifically for a header different from the Restoux La Défense console used in Post 29. This is a distinct image: a wide cabinet shot at the Computer History Museum, with access panels open showing the cordwood module bays, not a console.
  • Visually it conveys the 6600’s defining engineering signature – the cylindrical “+” cross-section freon-cooled chassis – which a console shot does not show.
  • High resolution (4098 x 2853 px), tested-good Flickr CC BY 2.0 provenance from a well-known computing-history photographer.
  • Caption: “Header: The CDC 6600 at the Computer History Museum, with access panels open. The ‘plus-sign’ cylindrical chassis was Cray’s solution to the heat-dissipation problem of cramming 400000 transistors into one cabinet – with freon coolant flowing through the central cooling tower. Photo by Jitze Couperus via Flickr, CC BY 2.0.”

Backup header A: #6 (CHM console by The wub, CC BY-SA 4.0). A different console from the Restoux one, modern-resolution, ShareAlike licence. Use if the editorial preference is “console image consistent with Post 29 styling but not literally the same photo”.

Backup header B: #2 (CDC 6600 mainframe at Grande Arche, Hullie, PD). Wide cabinet shot, exact same exhibition as the Restoux console (La Défense), but Public Domain release rather than CC BY. Lower resolution than #1.

Backup header C: #10 (Cineca 1970 in situ, CC BY-SA 4.0). Period photograph of a working installation rather than a museum shot. Low resolution (619 x 592 px) – only suitable as a header if upscaled or used as a stylised hero overlay; otherwise use as a body image.

Rejected (Fair Use Only / Restricted)

Subject URL License Reason Source
Watson Jr. “janitor memo” facsimile (28 Aug 1963). The famous memo where Watson Jr. asks how IBM lost industry leadership to a 34-person company “including the janitor” https://www.computerhistory.org/revolution/supercomputers/10/33/62 “© International Business Machines Corporation (IBM)” – Computer History Museum reproduces it “Courtesy of the IBM Corporate Archive” under one-time exhibition permission. Republication outside CHM context is not authorised. This was the most-asked-for image in the brief; it cannot be used under a free licence Computer History Museum / IBM Corporate Archive
James E. Thornton portrait https://www.computer.org/profiles/james-thornton – IEEE Computer Society portrait No CC or PD release. IEEE Computer Society copyright IEEE Computer Society
Thornton on the cover of “Design of a Computer: The Control Data 6600” (1970) https://archive.computerhistory.org/resources/text/CDC/cdc.6600.thornton.design_of_a_computer_the_control_data_6600.1970.102630394.pdf The book is © 1970 Control Data Corporation. Not in public domain unless it can be shown the no-notice or non-renewal rules apply – which has not been verified, and the CHM copy is hosted under educational-use terms Control Data Corporation / CHM hosted PDF
CERN computer center 1965 with CDC 6600 https://cds.cern.ch/ (e.g. record 917096, “Working at a Ferranti-Argus graphics display linked to a CDC 6600”, 1975) All examined CERN PhotoLab images surveyed display “© CERN” with no CC tag. CERN’s PhotoLab photographs are © CERN; reuse outside CERN is not free-licence CERN Document Server
NCAR / UCAR CDC 6600 photographs https://www.cisl.ucar.edu/ncar-supercomputing-history/cdc6600 – “Cray supercomputer” photo COMMS_302_CDC6600_004cr.png UCAR’s terms of use specify “Non-commercial promotion of NSF NCAR and UCAR work” with required UCAR attribution – this is a custom restrictive licence, not Creative Commons. UCAR is not released under CC-BY. Image gallery items on OpenSky are restricted to UCAR-related promotion. Unsuitable for this blog without obtaining UCAR permission, even though the blog is non-commercial in nature, because the UCAR terms require the use to be promoting NCAR/UCAR work specifically UCAR / NCAR (cisl.ucar.edu, opensky.ucar.edu)
Lawrence Livermore CDC 6600 photographs https://flickr.com/photos/llnl/ and https://www.llnl.gov/ archives LLNL Flickr stream and llnl.gov image library do not appear to release historic 1960s computing photos under a CC licence by default. NARA may hold derivative materials but a search did not return PD-tagged CDC 6600 photos in the NARA / DVIDS public domain archive. No verified PD photo of the 6600 at LLNL was located. Stock-image services (Science Source) hold LLNL CDC 6600 photos but under commercial copyright LLNL / Science Source
“Typical CDC 6600 installation” CDC publicity photos https://www.computerhistory.org/revolution/supercomputers/10/33 (CHM Revolution gallery) CHM hosts “Courtesy of Control Data Corporation” / © CDC. Educational fair use only on CHM; republication restricted Computer History Museum
“Cray with CDC 6600” press / publicity photos (referenced in Britannica, Computerworld, Star Tribune archives) All located examples are © CDC or © Star Tribune; no CC release Various corporate archives
Charles Babbage Institute CDC 6600 photographs https://cbi.umn.edu/ Restricted-use terms; reuse requires written permission Charles Babbage Institute, U. Minnesota
CHM “James Thornton” or “CDC 6600 design team” photos https://www.computerhistory.org/ “Courtesy of CDC” / © CDC; not freely licensed Computer History Museum

Notes / Open Questions

Major surprises

  • The 6600 itself is well-photographed under free licences. Unlike the 1604, where only museum service-bay shots existed under free licences, the 6600 has 12+ distinct free-licence photographs: CHM (multiple), London Science Museum (multiple), Living Computer Museum, Cineca Italy (in situ 1970), and Grande Arche Paris. Header choice is genuinely a curatorial decision rather than a forced compromise.
  • Watson Jr. portrait situation: surprisingly clean. Three independent PD sources for Watson Jr. (#14 State Dept c. 1980, #15 NARA 1978 with Carter, #16 1937 Brown senior). All are unambiguously PD-USGov or PD-no-notice. No fair-use claim is needed for a Watson Jr. portrait. This is better than feared. The trade-off: none of the free-licence Watson images shows him in his 1963 IBM presidency context (the era of the janitor memo). The closest is #16 (1937 Brown senior) for “young Watson Jr.” or #14 (c. 1980 State Dept ambassadorial portrait) for “older Watson Jr.” The 1963 IBM-CEO Watson is fair-use territory only.
  • The “janitor memo” facsimile is locked up. This was the brief’s most-asked-for piece, and it is unambiguously © IBM at the Computer History Museum. The CHM page itself reproduces the memo “Courtesy of the IBM Corporate Archive” under one-time exhibition permission. No facsimile reproduction in free-licence form was found. The text of the memo is so brief (~8 sentences) that the post can simply quote the memo in prose without needing the facsimile – which is the recommended workaround. If the post wants the typewritten letterhead visual element, the closest legal substitute is to render the quoted text in a styled blockquote with a typewriter font.
  • No James E. Thornton portrait on Wikimedia Commons. This was the brief’s other key portrait request. Searches in Commons, Wikipedia, IEEE Computer Society, and CHM all returned no free-licence portrait of Thornton. The only Thornton image accessible online is the IEEE Computer Society profile page, which is © IEEE. A non-trivial gap. Recommendation: describe Thornton in prose, without a portrait. If a portrait is essential, the post would need to either contact IEEE Computer Society for one-time educational-use permission, or run the Watson-Jr-and-CDC-team narrative as a “no faces” prose piece.
  • CERN, NCAR, and LLNL photo archives are NOT freely licensed. This is the second-biggest finding of the sweep:
    • CERN PhotoLab is © CERN. CDS records like 917096 (graphics display + 6600, 1975) and 2273012 (cordwood module, 1964) are unambiguously copyrighted to CERN.
    • UCAR/NCAR uses a custom “non-commercial promotion of NCAR/UCAR work” licence – which is more restrictive than CC BY-NC. Personal-blog use is not within the permitted scope.
    • LLNL does not have a CC-BY release of historic 1960s computing photos. Science Source and similar stock houses hold the CDC 6600 / LLNL imagery commercially.
    • Combined effect: the three most historically interesting CDC 6600 installations (CERN, NCAR, LLNL) are all locked up. The free-licence record of the 6600 in the wild is essentially the Cineca Italy 1970 photo (#10) and museum restorations. This is a notable gap and worth being upfront about in the post’s “where the actual machines were” beat.

Documented gaps (still missing, no free-licence option found)

  1. James E. Thornton portrait. No free licence anywhere. Use prose description.
  2. Watson Jr. memo facsimile. © IBM. Use a quoted blockquote of the text instead.
  3. CERN computer center 1965 with CDC 6600. © CERN. The post can describe the CERN delivery (17 January 1965) in prose with a citation but not show a photo.
  4. NCAR Mesa Lab 1971-1979 with CDC 6600. UCAR-restricted. Same prose-only workaround.
  5. LLNL CDC 6600 (1964-). Stock-house copyright. Same prose-only workaround.
  6. Watson Jr. in 1963 IBM-CEO context. PD options are all from later (1978, c. 1980) or much earlier (1937). The “Watson at IBM HQ in 1963” press photographs are corporate IBM copyright.

Author / licence verification

  • All Wikimedia Commons images above were verified by opening the file description page directly. Author name, upload date, and licence template were checked.
  • Three licence categories require attention in the post’s image attribution policy:
    • CC BY-SA 4.0 images (#6, #10, #13, #18, #19, #20) require attribution and share-alike.
    • CC BY 2.0 / 2.5 / 3.0 images (#1, #4, #5, #7, #8, #11, #12, #21) require attribution.
    • CC0 / Public Domain images (#2, #3, #14, #15, #16, #17) require no attribution legally; courtesy attribution is good practice and is given in the captions above.
  • The CC BY-SA 4.0 images carry a share-alike obligation: any blog post including them must allow downstream readers the same CC BY-SA-4.0 freedoms over the post’s image use. This is normally satisfied by a footer attribution block without licensing the post’s prose under CC BY-SA, but the policy is worth confirming with the blog’s editorial template.
  • Computer History Museum, Charles Babbage Institute, CERN, UCAR, and LLNL hold the bulk of the historically significant period CDC 6600 corporate / installation photographs. None release them under free licences by default. If the post needs the canonical CERN-1965 or LLNL-1964 image, it would require institutional permission.