About Special Viewer

For information about the user authorization, please refer to [ About User Authorization ].

About Special Viewer

To download and view a product that requires the special viewer, you need to install special software according to its category.
You do not need to install the software if you view it in browser.

Operating Environment and System Requirements

You can view items which require the special viewer by downloading or browser streaming (member only).

Download and view

Following operating environment is required to download and view items which require the special viewer.

Windows Mac
OS Platforms
  • Windows 7 (32/64-bit version)
  • Windows 8.1 (32/64-bit version)
  • Windows 10 (32/64-bit version)
  • Mac OS X 10.8 / 10.9 / 10.10 / 10.11
  • * On Mac, only products viewable with Cypher Guard for PDF are supported.
  • * As Microsoft has ended support for Windows XP, Windows Vista and Windows 8, our support for these OS has ended as well.
    The software may continue to run without issue; however, DLsite.com does not offer any support for it.
  • * Internet connection is required at the time of authentication.

Information for mobile devices

Stream in browser* Member account is required

If you are a member, you can view items in browser via DLsite Streaming App, [ DLsite Play ].
(Games are not supported.) For more details, please refer to [ About Browser Streaming ].

DLsite Streaming App: DLsite Play

Download Viewer

For Windows, choose one of the following methods to install the software. When the download is complete, double-click the downloaded file to install the software.
For Mac, install the software in the personalized installation.

Package Installation (Windows)

You can download and install in a single package all the necessary software to view products that require the special viewer.
(DLsite Viewer, Cypher Guard for PDF, Cypher Guard for Movie and Cypher Guard Browser)
Please install this package if you have several products that require the special viewer or if you are not sure about which software to install.

Necessary software

DLsite Installer Pack

The installer automatically examines the OS and install an appropriate program.
Windows Vista (64-bit version) is not supported.

Personalized Installation (Windows)

After you extract the product file, please find an html file ending with "_readme.html".
The necessary software for the purchased products and other important information is indicated in this file.
When the download is complete, double-click the downloaded file to install the software.

Viewer name File extension Necessary software
DLsite Viewer .dlst

DLsite Viewer

Cypher Guard for PDF .cpd

CypherGuard for PDF

You need Adobe Reader (free software) separately.

Cypher Guard for Movie .cvd

CypherGuard for Movie

This software will appear as "Cypher Player" after installation.

Cypher Guard Browser .exe

CypherGuard for Browser

Personalized Installation (Mac)

Viewer name File extension Necessary software
Cypher Guard for PDF .cpd

CypherGuard for PDF (for Mac)

About DLsite Viewer

For more details about how to operate DLsite Viewer, please refer to [ DLsite Viewer User Manual ].

Authorization and Viewing

Authentication is required only the first time you view a product. (When you double-click the product file, the following window will appear.)
If you choose to save your login ID and password, they will no longer be requested when you view the product.

User Authentication

For Members Please enter your DLsite.com login ID and password.
If you choose to save your login ID and password, they will no longer be requested when you view the product.
For Guests Please enter your order number and password as provided in the confirmation email when you purchased the product.
You must authenticate within 7 days of the date of purchase.

For Guests

If you purchase products which require the special viewer as a guest, the file(s) may no longer be viewable if you perform the following:

  • Change/replace your operating system.
  • Reformat the hard disk drive on which Windows is installed.
  • Change/Replace your hard disk.

If such is the case, if you wish to view the product again you will need to repurchase it.


Products which require the special viewer have the following limitations to prevent unauthorized redistribution.

  • They are viewable only on the PC in which you authenticated the file(s).
  • Capture and print functions of images are disabled. (Although printing or capturing images may be possible with a demo version, you cannot use these functions with the purchased version.)
  • The files are not viewable via Remote Desktop or virtual operating environments such as Virtual PC.
  • The files are not viewable on Windows OS that is installed on virtual PC software (VMware, crossover, etc.).

Operation When Using Anti-Virus Software

Sometimes, anti-virus software such as avast! or Norton Internet Security may falsely recognize the software as a virus and prevent you from downloading or browsing the file(s). If this is the case, please try downloading or browsing the file(s) with your anti-virus software temporarily turned off, or manually set allowances for the software.

Especially when you are using free anti-virus software such as avast!, AVG, ANTIVIR and COMODO, please confirm the normal operation of the software prior to making a purchase.


If you have problems in viewing the product, please check [ Notice ] and try the following.

  • You cannot view the product if the product file is compressed. Please refer to [ Extraction Tools ].
  • Restart your OS and try again.
  • On Windows OS, you may need to execute the file with administrator privileges.
    Try starting the necessary software and the product file by right-clicking on the icon to choose "Run as administrator".

If you get an error...

Please check if the error message/code you received is included in the list of [ Special Viewer ] on the Help page.

If the above does not solve the problem, please describe the error message or displayed screen details and [ Contact Us ] for assistance.
You can copy the entire error message by holding the [CTRL] key and pressing the [C] key when the window is focused (displayed on top of other windows).

Circle's Guide