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Friday, 28 November 2025

Internet Archive moves to .lcpl files

If you have e recently, you may have been surprised by the file download extensions suffix on those books which can be downloaded: the download file is now has an ".lcpl" suffix. Instead of the normal .ascm file type which can be downloaded then automatically opened using Adobe Digital Editions, now we need a different app and to work with this different file download type.

Like .ascm files, the Readium LCP file type - with the .lcpl suffix - is also a digital rights protected pdf or ePub file. The LPC of the Readium file name stands for Licensed Content Protection. To open and read these file on our PCs, we can't use Digital Editions: we need to download the Thorium Reader app. We can download Thorium Reader, which is also free, from the Thorium site here: https://thorium.edrlab.org/en/

To download and open the .lcpl file in Thorium Reader, it is the same process as for Digital Editions. We simply borrow our desired book from the Internet Archive, scroll down the page and look for our desired LCP file type download link and click on the link for either a pdf or an ePub .lcpl file.

We download the file to our normal download location, open Thorium Reader, navigate to our downloaded .lcpl file and open the file just as we would normally have done in Adobe Digital Editions. Once we have opened one file, Thorium Reader should remember the location for future borrowings.

Not too dramatic, after all :-)


Sam

3 comments :

  1. It says you have to have a password to read the lcpl file that I downloaded. I have Thorium Reader installed just now and I just downloaded a digital book from the Internet Archive and I can't open it.

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    Replies
    1. Darn it. Thanks for letting me know. Hmm - I wonder if this may be as a result of the hacking that happened to the Internet Archive website last year? That they have beefed up all their security now :-(

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    2. And just a thought: I don't know if - now you have the file downloaded - Calibre might read the lcpl files? I see there is apparently a patch on GitHub at https://github.com/Leseratte10/lcpl-calibre-plugin (could be worth a try?)

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