# No license key was provided, running in demo mode

**URL:** <https://pdfjs.community/t/no-license-key-was-provided-running-in-demo-mode/902>\
**Category:** Technical Support\
**Created:** [July 27, 2021, 2:37am UTC](https://pdfjs.community/t/no-license-key-was-provided-running-in-demo-mode/902 "2021-07-27T02:37:21Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [July 27, 2021, 2:37am UTC](https://pdfjs.community/t/no-license-key-was-provided-running-in-demo-mode/902/2 "2021-07-27T02:37:24Z")

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**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Adding your license key - Development](https://pdfjs.express/documentation/get-started/add-license-key#development)
- [PDF.js Express Utility API - Usage](https://pdfjs.express/documentation/utils#usage)
- [Integrating existing Angular project with PDF.js Express - Prerequisites](https://pdfjs.express/documentation/get-started/angular/exist-project#prerequisites)

APIs:
- [CoreControls - preloadPDFWorker(pdfBackendType, workerHandlers)](https://pdfjs.express/api/CoreControls.html#.preloadPDFWorker__anchor)
- [Development](https://pdfjs.express/api/utils/index.html#__anchor)
- [CoreControls.BlackBoxAnnotationManager - preloadAnnotations(An)](https://pdfjs.express/api/CoreControls.BlackBoxAnnotationManager.html#preloadAnnotations__anchor)

Forums:
- [Watermark doesn’t get removed after putting license key](https://pdfjs.community/t/watermark-doesnt-get-removed-after-putting-license-key/193/1)
- [Pdjs express watermark appearing on registered domain even after adding license key](https://pdfjs.community/t/pdjs-express-watermark-appearing-on-registered-domain-even-after-adding-license-key/453/4)
- [Anotastion color chnaged when used merge api](https://pdfjs.community/t/anotastion-color-chnaged-when-used-merge-api/799/3)

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_[View the full topic](https://pdfjs.community/t/no-license-key-was-provided-running-in-demo-mode/902)._