# Digital signature problem

**URL:** <https://pdfjs.community/t/digital-signature-problem/741>\
**Category:** Technical Support\
**Created:** [April 30, 2021, 5:14pm UTC](https://pdfjs.community/t/digital-signature-problem/741 "2021-04-30T17:14:15Z")\
**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:** [April 30, 2021, 5:14pm UTC](https://pdfjs.community/t/digital-signature-problem/741/2 "2021-04-30T17:14:20Z")

</div>

**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:
- [Create measurement annotations - Create measurement annotations with the UI](https://pdfjs.express/documentation/measurement/create#create-measurement-annotations-with-the-ui)
- [Best practices for PDF.js Express - Store annotations](https://pdfjs.express/documentation/learn-more/best-practices#store-annotations)
- [Add signature fields to PDFs - createSignHereElement](https://pdfjs.express/documentation/signature/signature-field#createsignhereelement)

APIs:
- [VerificationOptions](https://pdfjs.express/api/VerificationOptions.html#__anchor)
- [ExpressUtils(optionsopt) - # async set() → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#set__anchor)
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)

Forums:
- [Add signature fields to PDFs](https://pdfjs.community/t/add-signature-fields-to-pdfs/713/1)
- [How to protect my license key](https://pdfjs.community/t/how-to-protect-my-license-key/560/1)
- [How to delete highlight annotation from pdf with pdf js express in react](https://pdfjs.community/t/how-to-delete-highlight-annotation-from-pdf-with-pdf-js-express-in-react/379/4)

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_[View the full topic](https://pdfjs.community/t/digital-signature-problem/741)._