# Access to PDF.js viewer when your servers are unavailable

**URL:** <https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260>\
**Category:** Technical Support\
**Created:** [December 20, 2021, 8:41am UTC](https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260 "2021-12-20T08:41:06Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![user45](https://avatars.discourse-cdn.com/v4/letter/u/7ab992/32.png) [@user45](https://pdfjs.community/u/user45)\
**Post date:** [December 20, 2021, 8:41am UTC](https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260/1 "2021-12-20T08:41:06Z")

</div>

**Which product are you using?**

**PDF.js Express Version**

**Detailed description of issue**  
We are exploring the possibility of using the PDF.js express viewer in our app.  
Is there way to confirm the license without sending request to the PDF.js Server? What if your server be unavailable? (viewer will not work? - I saw this diagram - [Commercial licence activation - #5 by Logan](https://pdfjs.community/t/commercial-licence-activation/1035/5))

And the next one, did the license allow to view pdf files in a commercial app?

**Expected behaviour**  
To provide access to users we want to use pdf.js express viewer without checking license on server another than ours.

**Does your issue happen with every document, or just one?**  
every document

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_[View the full topic](https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260)._