AI Proofreading Tool 'Bun-ken,' Safe for Workplace Use, Releases New Feature to Mask Personal and Confidential Information
Web Rider, Inc. has launched a new "Masking Feature" for its AI proofreading tool, "Bun-ken." This allows users to redact personal and confidential information before using the "AI Assist" function or other AI tools like ChatGPT and Gemini, reducing the risk of accidental data leaks. The feature, which is patent-pending, aims to provide a more secure way for businesses to leverage AI.
📋 Article Processing Timeline
- 📰 Published: March 28, 2026 at 00:46
- 🔍 Collected: March 28, 2026 at 21:59 (21h 12m after Published)
- 🤖 AI Analyzed: April 15, 2026 at 03:40 (413h 41m after Collected)
Web Rider, Inc. (Headquarters: Nakagyo-ku, Kyoto; CEO: Shigeoki Matsuo) has released a "Masking Feature (*)" for its AI proofreading tool, "Bun-ken," which allows users to redact personal and confidential information in its "AI Assist" function.
The masked text can also be used with other AI tools such as ChatGPT and Gemini, reducing the risk of accidentally sending personal or confidential information to an AI.
Bun-ken has always provided a secure environment where input text is not stored on servers and is not used for AI training.
This new feature allows users to use the AI Assist function with even greater peace of mind.
*The masking feature is patent-pending (Patent Application No. 2026-041249 / Design Application No. 2026-004758).
## ■ Development Background: Responding to the Need for Security in the Workplace
In recent years, the development of guidelines for the use of generative AI has been rapidly advancing in companies and local governments, and the operational rule of "refraining from inputting highly sensitive information" is becoming common.
When sending text containing confidential information to an AI, adjustments such as deleting or changing specific words or phrases are necessary.
The masking feature was developed to streamline these text adjustments.
## ■ Situations Where the Masking Feature is Useful
The masking feature of Bun-ken allows you to quickly hide confidential information and is useful in the following situations:
- When you want to summarize meeting minutes or documents containing confidential information.
- When you want to rewrite an email containing personal information.
- When you want to reduce the risk of accidentally sending confidential information to an AI.
**【Examples of words that should be masked】**
Client company names / Personal names (contacts, customers, employees, etc.) / Email addresses / Phone numbers / Addresses / Identification numbers (customer IDs, employee numbers, contract numbers, etc.) / Financial information (quotes, sales figures, etc.) / Payment information (account numbers, credit card numbers, etc.) / Login information (IDs, passwords, etc.) / API keys / Internal system URLs / IP addresses / Project names / Unreleased product names / Services under development, etc.
## ■ Four Features of the Masking Function
### 1. Batch Masking by Specifying Keywords
You can search for words that appear multiple times in the text, such as specific company or project names, and mask them all at once.
### 2. Masking by Selecting Text Strings
It is also possible to mask individual text strings by selecting them.
### 3. Compare Before and After Masking Displays
If you want to check "what was hidden" during your work, you can instantly toggle the display on and off.
Also, if you want to unmask something, you can restore it with a single click.
### 4. Copy Masked Text with a Single Click
The masked text can be pasted into generative AI tools like ChatGPT and Gemini.
## ■ A Masking Feature to Promote Safer and More Secure AI Utilization
The Bun-ken team positions the masking feature not as "a feature to restrict AI use," but as **"a feature to master AI more safely and securely."**
The day may come in the future when AI security is further enhanced, and such features become unnecessary.
However, precisely because we are in a transitional period of expanding use, we are providing this function as an "easy-to-use option" that alleviates workplace anxieties and aligns with practical work.
In the future, we will consider updates that balance security and convenience, such as adding a dictionary registration function for commonly hidden words within a team and introducing an automatic masking assistance function.
Please look forward to the future evolution of the masking feature.
## ■ About the Writing Support Tool "Bun-ken," with Over 13,000 Cumulative Users
"Bun-ken" is **a writing support tool that utilizes AI and proprietary algorithms to improve text quality and creation efficiency.**
In addition to the **"AI Assist"** function that uses LLMs (Large Language Models) to propose rewrites and improvements, it is equipped with **"Rule-based Proofreading and Refinement"** functions that check for typos and inappropriate expressions based on a unique dictionary of rules.
There is also a **"Dictionary"** function that supports consistent notation within an organization, promoting consistent marketing and communication.
Furthermore, since the input text is not stored on Bun-ken's cloud servers, you can use it with peace of mind regarding security.
Bun-ken Official Website: https://rider-store.jp/bun-ken/
## ■ About Web Rider, Inc. (https://web-rider.jp/)
Under the philosophy of "Increasing Heroes," Web Rider provides web marketing support centered on search-driven customer acquisition (SXO/SEO).
In addition to developing the AI proofreading tool "Bun-ken," which protects and refines writing, the company also produces content such as "The Silent Web Marketing" and "The Silent Web Writing."
With a policy of pursuing human-touch marketing, we promote user-first marketing that feels personal and warm.
━━━━━━━━━━━━━━━━━
【Web Rider, Inc.】 (https://web-rider.jp/)
■ Representative: Shigeoki Matsuo
■ Established: April 2010
■ Locations:
(Kyoto Head Office) SOZO+ bldg. 6/7F, 437 Jumonjicho, Nakagyo-ku, Kyoto
(Tokyo Branch) BLOCKS Ebisu 407, 1-11-2 Hiroo, Shibuya-ku, Tokyo
■ Business Content: Web marketing support, SEO/SXO support, web content creation, SaaS development, training for content marketers
■ Contact: https://rider-store.jp/bun-ken/contact
━━━━━━━━━━━━━━━━
The masked text can also be used with other AI tools such as ChatGPT and Gemini, reducing the risk of accidentally sending personal or confidential information to an AI.
Bun-ken has always provided a secure environment where input text is not stored on servers and is not used for AI training.
This new feature allows users to use the AI Assist function with even greater peace of mind.
*The masking feature is patent-pending (Patent Application No. 2026-041249 / Design Application No. 2026-004758).
## ■ Development Background: Responding to the Need for Security in the Workplace
In recent years, the development of guidelines for the use of generative AI has been rapidly advancing in companies and local governments, and the operational rule of "refraining from inputting highly sensitive information" is becoming common.
When sending text containing confidential information to an AI, adjustments such as deleting or changing specific words or phrases are necessary.
The masking feature was developed to streamline these text adjustments.
## ■ Situations Where the Masking Feature is Useful
The masking feature of Bun-ken allows you to quickly hide confidential information and is useful in the following situations:
- When you want to summarize meeting minutes or documents containing confidential information.
- When you want to rewrite an email containing personal information.
- When you want to reduce the risk of accidentally sending confidential information to an AI.
**【Examples of words that should be masked】**
Client company names / Personal names (contacts, customers, employees, etc.) / Email addresses / Phone numbers / Addresses / Identification numbers (customer IDs, employee numbers, contract numbers, etc.) / Financial information (quotes, sales figures, etc.) / Payment information (account numbers, credit card numbers, etc.) / Login information (IDs, passwords, etc.) / API keys / Internal system URLs / IP addresses / Project names / Unreleased product names / Services under development, etc.
## ■ Four Features of the Masking Function
### 1. Batch Masking by Specifying Keywords
You can search for words that appear multiple times in the text, such as specific company or project names, and mask them all at once.
### 2. Masking by Selecting Text Strings
It is also possible to mask individual text strings by selecting them.
### 3. Compare Before and After Masking Displays
If you want to check "what was hidden" during your work, you can instantly toggle the display on and off.
Also, if you want to unmask something, you can restore it with a single click.
### 4. Copy Masked Text with a Single Click
The masked text can be pasted into generative AI tools like ChatGPT and Gemini.
## ■ A Masking Feature to Promote Safer and More Secure AI Utilization
The Bun-ken team positions the masking feature not as "a feature to restrict AI use," but as **"a feature to master AI more safely and securely."**
The day may come in the future when AI security is further enhanced, and such features become unnecessary.
However, precisely because we are in a transitional period of expanding use, we are providing this function as an "easy-to-use option" that alleviates workplace anxieties and aligns with practical work.
In the future, we will consider updates that balance security and convenience, such as adding a dictionary registration function for commonly hidden words within a team and introducing an automatic masking assistance function.
Please look forward to the future evolution of the masking feature.
## ■ About the Writing Support Tool "Bun-ken," with Over 13,000 Cumulative Users
"Bun-ken" is **a writing support tool that utilizes AI and proprietary algorithms to improve text quality and creation efficiency.**
In addition to the **"AI Assist"** function that uses LLMs (Large Language Models) to propose rewrites and improvements, it is equipped with **"Rule-based Proofreading and Refinement"** functions that check for typos and inappropriate expressions based on a unique dictionary of rules.
There is also a **"Dictionary"** function that supports consistent notation within an organization, promoting consistent marketing and communication.
Furthermore, since the input text is not stored on Bun-ken's cloud servers, you can use it with peace of mind regarding security.
Bun-ken Official Website: https://rider-store.jp/bun-ken/
## ■ About Web Rider, Inc. (https://web-rider.jp/)
Under the philosophy of "Increasing Heroes," Web Rider provides web marketing support centered on search-driven customer acquisition (SXO/SEO).
In addition to developing the AI proofreading tool "Bun-ken," which protects and refines writing, the company also produces content such as "The Silent Web Marketing" and "The Silent Web Writing."
With a policy of pursuing human-touch marketing, we promote user-first marketing that feels personal and warm.
━━━━━━━━━━━━━━━━━
【Web Rider, Inc.】 (https://web-rider.jp/)
■ Representative: Shigeoki Matsuo
■ Established: April 2010
■ Locations:
(Kyoto Head Office) SOZO+ bldg. 6/7F, 437 Jumonjicho, Nakagyo-ku, Kyoto
(Tokyo Branch) BLOCKS Ebisu 407, 1-11-2 Hiroo, Shibuya-ku, Tokyo
■ Business Content: Web marketing support, SEO/SXO support, web content creation, SaaS development, training for content marketers
■ Contact: https://rider-store.jp/bun-ken/contact
━━━━━━━━━━━━━━━━