ACSM (Adobe Content Server Message) and LCPL (Licensed Content Protection License) files both manage digital rights (DRM protection) for eBooks, ensuring access is restricted to authorized users. However, their functions and uses differ significantly. Here's a detailed comparison:
1. ACSM File and LCPL File Overview
1. DRM Protection
ASCM File: The ACSM format is associated with Adobe DRM, a proprietary digital rights management system developed by Adobe. It is one of the oldest and most widely used DRM systems, adopted by many eBook vendors, including libraries and retailers like Kobo, Nook, Google Play Books, and OverDrive.
Adobe DRM provides robust security features and extensive control over content distribution. To access eBooks protected by Adobe DRM, users must create an Adobe ID and use Adobe Digital Editions (ADE).
LCPL Files: LCPL files use LCP DRM developed by Readium, which is an open-source DRM solution that provides an alternative to proprietary systems like Adobe DRM. Users need an LCP-compatible reader, but there is no requirement to create an account with a specific vendor. LCP DRM is designed to avoid vendor lock-in, offering compatibility with various third-party applications and greater flexibility in reader choice. It provides a more open and less intrusive DRM solution compared to Adobe DRM..
Adobe DRM and LCP DRM are two leading DRM systems used to protect digital content. Adobe DRM is known for its strong security and strict content control, while LCP DRM emphasizes user-friendliness and broad compatibility, catering to different publishing requirements and user preferences.
2. File Content and Purpose
ACSM File: ACSM files do not contain the eBook itself, instead, they provide information that ADE uses to download DRM-protected eBooks, typically in ePub or PDF format. The ACSM file acts as a key, linking the eBook to your specific Adobe ID to enforce DRM restrictions and enable the download of the protected content. When an ACSM file is opened in ADE, it triggers the download of the actual eBook to your device.
LCPL File: LCPL files contain a license that provides access to content protected by LCP DRM, serving as an alternative to Adobe DRM. Unlike ACSM files, LCPL files include the encrypted eBook content directly, secured by LCP DRM. This allows LCP-compatible readers to access the content without additional download steps. The primary function of LCPL files is to manage eBook restrictions, such as copying and lending. They allow users to access the encrypted eBook by supplying the required decryption key or passphrase.
3. File Compatibility
Both ACSM and LCPL files are not actual eBooks but serve as authorization files to verify that you have the rights to download the content. They are used with Adobe-compliant or LCP-compliant software to convert the content into an EPUB or PDF format.
ACSM File: To open and download ACSM files, users need to install ADE and create an Adobe ID to authorize their device. After that, users can drag the acsm file into ADE to start the download. Once the download is complete, the Adobe DRM-encrypted EPUB or PDF can be located by right-clicking the book cover in ADE and selecting 'Show File in Explorer'.
LCPL File: LCPL files can be opened with applications that support LCP DRM, such as Thorium Reader and other open-source eReaders like FBReader. This offers greater flexibility across multiple platforms. For ease of use, we recommend Thorium Reader. To open an LCPL file, drag and drop it into the program, then click the three dots and select 'Save as' after the file has been successfully imported.
LCP-protected files can be accessed in Thorium Reader using a passphrase, which is typically provided at the time of purchase or borrowing. Unlike other DRM systems, LCP does not require complex account setups or device authorization limits.
To summarize ACSM vs. LCPL, here's a comparison table:
| Feature | ACSM | LCPL |
|---|---|---|
| Purpose | Authorization file for downloading eBooks | License file for accessing encrypted content |
| Content | Does not contain eBook content; links to Adobe ID | Contains encrypted eBook content directly |
| DRM System | Adobe DRM | LCP DRM |
| Software Required | Adobe Digital Editions (ADE) | LCP-compliant readers (e.g., Thorium Reader, FBReader) |
| Account Requirement | Requires Adobe ID | No account or personal information required |
| File Handling | Opens in ADE, downloads content in EPUB/PDF | Opens directly in LCP-compatible readers |
| Encryption | Content is encrypted by Adobe DRM | Content is encrypted by LCP DRM |
| User Flexibility | Limited to Adobe's ecosystem | Broader compatibility with multiple readers |
2. How to Remove DRM from ACSM and LCPL File?
1. How to Unlock Readium LCP DRM-protected Files?
Regarding Readium LCP DRM version 2.5, no DeDRM solutions can currently break this strengthened DRM. However, Epubor offers a service that can help you back up all your eBooks with LCP DRM, including those protected by Readium LCP DRM version 2.5. To get started, simply click the button below to order the service and send your LCPL files and passphrase to epubor.alice@gmail.com.
Order LCPL Conversion Service Here
2. How to Remove DRM from Adobe DRM-protected Files?
To remove DRM from Adobe DRM-protected files, first download the ACSM file using ADE or an ACSM plugin, which will convert it into an EPUB or PDF file with Adobe DRM protection. Next, use a DRM removal tool to strip the Adobe encryption from the downloaded EPUB or PDF files. For detailed instructions, consult a step-by-step guide on removing Adobe DRM.
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