Opening an LCPL File

The LCPL file type is primarily associated with Readium LCP.

LCPL	File extension: LCPL
	File type:	JSON file

What is an LCPL file?

LCPL files mostly belong to Readium LCP. LCPL files are license files used in eBook systems to manage digital rights.
They store licensing data in a JSON structure that details rules such as borrowing periods, usage limits, and access validations.
This file format is primarily used by the Readium LCP Client and works with systems similar to Adobe Digital Editions.
Key details summarized by FilExt.com include:

JSON Format: The file is structured in JSON, making it both human readable and machine parsable.

DRM Enforcement: It holds the conditions under which an eBook can be accessed.

Usage Control: It verifies that only authorized software can open and display the eBook.

FilExt.com tip: More technical details can be found at the Readium website.

How to open LCPL files

You need a suitable software like Readium LCP to open an LCPL file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your LCPL file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a LCPL file directly in the browser:. Just drag the file onto this browser window and drop it.

Online LCPL Text Viewer

Choose your .lcpl file to view

or drag and drop it here

Online File Viewer

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How to extract texts from LCPL files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from LCPL file or capture a screenshot, you can use our free Online LCPL File Viewer:

Just click the "Choose your .lcpl file to view" button on this page.
After your file is opened in browser,
click "Save as..." in the menu.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert LCPL files:

Readium LCP
See the previous paragraphs to learn more about the main application. LCPL files are often referred to as Readium LCP ebooks because this type of file is primarily created or used by this software.
Readium License Document (Licensed Content Protection) by Readium
The LCPL file is not a real ebook content, but the link to download the real ebook content. It serves as a Readium License Document, which is a component of Readium - an open-source reference system and rendering engine designed for EPUB publications. LCP, an acronym for "Licensed Content Protection," represents a Digital Rights Management (DRM) technology that has been specifically developed by the publishing industry. You can read LCP on some eReaders like Thorium Reader, but you cannot not decrypt the EPUB ebook, PDF or audiobooks. This file format is classified as EBooks.

LCPL format details:

Why is it important to know the file format? This is the only way to find out which program to use to open the file. The initial characters of a file are called signature, sometimes also referred to as "magic bytes". The signature can be used to infer the file format. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Knowledge is power - this also applies when dealing with unknown or faulty files. In the following you will find our evaluation of the LCPL files:

LCPL is a very common file type and predominantly uses a uniform format. The two most common formats are as follows:

95% of all LCPL files are Readium LCP DRM License Document files, which are based on the JSON file format. JSON (JavaScript Object Notation) is a lightweight data−interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. These files are text files, so they contain words and text. The files are often between 2.4 KB and 2.7 KB in size. This file type is new and state-of-the-art. The keywords encryption, issued, provider, content_key, algorithm, http://readium.org/lcp/profile-1.0, https://archive.org and updated are typical for these files. Files like these are sometimes connected to unse, cobiss, isbn, ellibs, diario, license, historia, geographic, national, pais and pour.
4% of all LCPL files use the popular JSON file format. These files contain text and words, not binary data. Most of these files are 3.1 KB to 3 KB in size. The files contain the following words: "encryption": {, issued, "provider": "https://www.editions-ellipses.fr" and "profile": "http://readium.org. Files like these are sometimes connected to livre.

All other LCPL files (1%) have no uniform format, often e.g. ZIP. Files like these are sometimes linked to tome, will, guide, mill, suplemento, cocina, libro, sikmb or coll. Drag & drop your file here to see the file format and a preview of your LCPL file!

Technical Data for LCPL File Extension

File classification:

eBook

Related files:

epub, acsm, mobi, azw3, lpf, lcp, icp, json, pdf

an lcpl JSON file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with LCPL files

Associate the LCPL file extension with the correct application.
Update your software that should actually open json files. Because only the current version supports the latest LCPL file format. Search, therefore, e.g. on the manufacturer website after an available Readium LCP update.
To make sure that your LCPL file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .LCPL file online - secure, fast, and no downloads needed.