內容簡介
**概要:**
Selective Image Guard 是一個輕量級的 WordPress 外掛，為您的網站圖像增加多層保護。針對攝影師、設計師和內容創作者，幫助防止盜用和未經授權使用他們的視覺內容。
**問題與解答:**
1. 這個外掛的主要功能是什麼？
- 答：Desktop Screenshot Prevention、Print Protection 和 Selective Protection 等功能，可以在偵測到特定鍵盤快捷鍵進行屏幕截圖時對受保護的圖像應用模糊濾鏡，防止用戶列印頁面時對受保護的圖像進行模糊處理，只會影響您在媒體庫中標記為受保護的圖像。
2. 如何使用這個外掛？
- 答：前往媒體庫，選擇要保護的圖像，點選“Protect this image” 選項，外掛將自動對選定的圖像應用前端保護，以防止未經授權的訪問。
3. 有沒有提供示範？
- 答：您可以在示範頁面上看到這個外掛的操作示例。
4. 有什麼重要注意事項？
- 答：這個外掛提供的只是一種阻嚇，並非絕對安全的解決方案。使用 CDN 時，必須將任何包含 sig-prot=1 參數的 URL 排除於緩存之外，以確保這個外掛的正常運作。同時，任何包括瀏覽器、伺服器和 CDN 緩存在內的網站緩存機制也必須排除包含 /protect-image/ 和 sig-prot=1 的 URL，這些 URL 必須直接從您的伺服器上提供，不得被緩存。
5. 這個外掛由誰開發？
- 答：開發者為 Jose Mortellaro。
外掛標籤
開發者團隊
② 後台搜尋「Selective Image Guard | A deterrent for unauthorized downloads and scraping」→ 直接安裝（推薦）
📦 歷史版本下載
原文外掛簡介
Selective Image Guard is a lightweight WordPress plugin that adds multiple layers of protection to your website’s images. It’s ideal for photographers, designers, and content creators who want to deter theft and unauthorized use of their visual content.
Key Features
Desktop Screenshot Prevention: Applies a blur filter to protected images when specific keyboard shortcuts for screenshots are detected. This is a deterrent, not a foolproof solution.
Print Protection: Blurs protected images when a user attempts to print the page.
Selective Protection: You control which images are protected. The plugin only affects images you mark as protected in the media library.
How It Works
Navigate to your media library and select the image you want to protect.
Check the “Protect this image” option.
The plugin will automatically apply front-end protections to the selected image to help prevent unauthorized access.
Free Features
The free version gives you solid protection against common image theft techniques:
DevTools Detection – Prevents users from opening browser developer tools to inspect and steal images.
JavaScript Disabling Detection – Detects when JavaScript is disabled, ensuring protections remain active.
Desktop Screenshot Prevention – Blocks most attempts to capture screenshots of your images on desktop.
Print Protection – Prevents printing of protected images directly from the browser.
PRO Features
The PRO version unlocks advanced and flexible controls for complete image protection:
Bulk Protection – Quickly apply protection to all images across your website with a single setting.
Featured Images Protection – Protects your WordPress featured images from theft.
Protection by Post Type – Apply image protection only where you need it (e.g., posts, pages, custom post types).
WooCommerce Product Galleries – Keep your product images safe and protect your online shop from unauthorized copying.
Watermark – Automatically add a customizable watermark to your images for extra security.
Premium Support – Get direct, priority support from the plugin author.
Don’t understimate the value of a deterrent.
This plugin provides a deterrent, not a foolproof solution. No client-side technique can offer 100% protection against a determined attacker.
But don’t underestimate the value of a deterrent.
Think about the methods used to keep mosquitoes away. Even if they don’t work 100%, would you rather be surrounded by hundreds of mosquitoes or just a couple? That’s the idea of a deterrent.
Examples of Use
Here are several examples where you would want to display an image on a site but discourage people from sharing it:
Online course slides – You want students to see diagrams or infographics, but not download or redistribute them outside your platform.
Stock photography previews – You show high-resolution images to logged-in subscribers, but do not want those same images shared publicly without a license.
Members-only content – For example, fitness programs or meal plans with recipe cards as images, visible only to paying members.
Confidential documents – An internal portal where staff see charts or scanned reports, but you do not want them forwarded outside the company.
Product prototypes – Showing early design mockups (e.g. fashion sketches or unreleased product photos) to investors or testers, but preventing leaks to competitors.
Protection against unauthorized scraping – Preventing automated bots from copying images and republishing them without permission.
E-commerce product photos – Protecting your catalog from competitors scraping product images to use in their own stores.
Real estate listings – Preventing property photos from being scraped and reused on unauthorized portals.
Artistic portfolios – Protecting photographers, illustrators, and designers from having their portfolio images scraped and reused without attribution.
News and media outlets – Protecting journalistic images from being scraped and re-hosted by content farms.
Stock agencies – Protecting preview images (with or without watermarks) from being scraped in bulk to avoid licensing.
Recipe or DIY blogs – Protecting step-by-step photos from being scraped and republished elsewhere.
More Information About Image Protection
For more details about image protection and the limitations of client-side techniques, read the article: How to Protect Images on WordPress (And How to Prevent Theft)
Credits
Developed by Jose Mortellaro
