# CypherGuard PDF

> Securely view protected and encrypted PDF documents with cryptographic technology. (iPhone/iPad app by CypherTec Inc..)

- Source: https://appshunter.io/ios/app/cypherguard-pdf/id781435650 (this page in markdown: same URL + `.md`)
- Developer: [CypherTec Inc.](https://appshunter.io/developer/507907491)
- Category: Business, Books
- Price: Free
- Rating: 1.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 29 MB
- Languages: American English, Japanese
- Released: 2013-12-29
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cypherguard-pdf/id781435650/reviews.md

## What is CypherGuard PDF?

This is a viewer for CypherGuard PDF (https://www.cyphertec.co.jp/services/cypherguard/products/#CypherGuard_PDF), which protects PDF documents using cryptographic technology.
In addition to regular PDF documents, you can also view encrypted PDF documents after authentication.

* CypherGuard PDF content files (.cpd files) that the distributor does not permit viewing on iOS cannot be viewed.
* To protect the content, this app does not support file printing.

## Key features

- View protected PDF documents
- Open encrypted PDF files
- Authentication for secure access
- Supports regular PDF documents
- Content protection features


## Frequently asked questions about CypherGuard PDF

### What is CypherGuard PDF?

CypherGuard PDF is an application designed to view PDF documents that have been protected using cryptographic technology. It allows users to open both regular PDFs and encrypted files after proper authentication.

### Can I view any PDF file with CypherGuard PDF?

You can view regular PDF documents and encrypted files. However, CypherGuard PDF content files (.cpd files) that the distributor has restricted from viewing on iOS cannot be opened.

### Does CypherGuard PDF support printing?

No, to ensure content protection, this application does not support file printing. This feature is intentionally omitted to maintain the security of the documents viewed.

### Is CypherGuard PDF free to use?

Yes, CypherGuard PDF is available for free. It is listed as a free application with no in-app purchases or advertisements.

### What devices is CypherGuard PDF compatible with?

CypherGuard PDF is compatible with iPhone, iPad, and iPod devices. It is designed for the iOS platform.

### How often is CypherGuard PDF updated?

The latest version of CypherGuard PDF is 1.8.0, last updated on March 26, 2026. While this indicates a recent update, historical update frequency is not detailed.

### What is the age rating for CypherGuard PDF?

CypherGuard PDF has an age rating of 4+, indicating it is suitable for users aged four and above. This suggests no mature content is present.

### What do users think of CypherGuard PDF?

Based on the available data, CypherGuard PDF has a rating of 1.0 stars from 3 ratings. This indicates a very low user satisfaction score.

## Version history (last 5 releases)

### 1.8.0 — 2026-03-26

* Support iOS 26 (Liquid Glass).
* Updated the app icon.
* Added a screen capture prevention feature.
* Added a ToC to the bundled "CypherGuard PDF Guide".
* Fixed a bug where search results were not cleared during new searches in the mini search viewer.
* Adjusted error codes and messages.
* Added a dialog prompting OS updates for users on iPadOS 26.0 and 26.0.1 due to an app crashing issue.
* Other minor adjustments and improvements.

### 1.7.0 — 2024-09-27

* Support iOS 18
* Changed supported OS to iOS/iPadOS 14 or higher
* Adjusted error codes
* Other minor adjustments

### 1.6.0 — 2023-09-22

・Moving CypherGuard PDF to the background while viewing content no longer closes the content being viewed.
・Added a feature that copy / move files from "History" to folders under "Documents".
・The icon is displayed on the left side of external files in "History" to make it easier to identify external files.
・Renamed "Bookmarks" screen to "Favorites".
・Renamed "Contents" screen to "Outline".
・Fixed some minor bugs.

### 1.5.1 — 2023-03-09

・見開きのPDFを開くと、表紙の有無に関わらず、１ページ目から見開き表示されてしまう問題を修正しました。
・その他、細かな不具合を修正しました。

### 1.5.0 — 2022-09-27

＊ 「外部ファイル」より開いたPDF・CPDファイルが、「最近使った項目」に表示されるようにしました。
＊ 「外部ファイル」より開いたPDF・CPDファイルに設定した「しおり」が、別のファイルの「しおり」として表示されてしまう問題を修正しました。 
＊ 「外部ファイル」よりPDF・CPDファイルを開く際のパフォーマンスを改善しました。
＊ 「CypherGuard PDF ガイド」の内容を更新しました。
＊ アプリのセキュリティ対策を強化しました。
＊ その他、細かな不具合を修正しました。

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| [チアキャリア(CheerCareer) ベンチャー就活アプリ](https://appshunter.io/ios/app/cheercareer/id1294969438) | — | Free | Business |
| [SimpleVenti](https://appshunter.io/ios/app/simpleventi/id6745219291) | — | Free | Business |

## More apps by CypherTec Inc.

- [CypherGuard EPUB](https://appshunter.io/ios/app/cypherguard-epub/id1556179410)

All apps by CypherTec Inc.: https://appshunter.io/developer/507907491

## Related topics

[cypherguard pdf](https://appshunter.io/ios/topics/cypherguard-pdf)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*