# Can a license key be used in more than one application?

**URL:** <https://pdfjs.community/t/can-a-license-key-be-used-in-more-than-one-application/929>\
**Category:** FAQ\
**Created:** [August 4, 2021, 6:16pm UTC](https://pdfjs.community/t/can-a-license-key-be-used-in-more-than-one-application/929 "2021-08-04T18:16:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![talles.sanavria](https://avatars.discourse-cdn.com/v4/letter/t/8e8cbc/32.png) [@talles.sanavria](https://pdfjs.community/u/talles.sanavria)\
**Post date:** [August 4, 2021, 6:16pm UTC](https://pdfjs.community/t/can-a-license-key-be-used-in-more-than-one-application/929/1 "2021-08-04T18:16:51Z")

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Hello

If we have more than one application can i use the same licence?

Local domain and public domain.

Thanks

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**Author:** ![Logan](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/logan/32/13_2.png) [@Logan](https://pdfjs.community/u/Logan)\
**Post date:** [August 4, 2021, 6:19pm UTC](https://pdfjs.community/t/can-a-license-key-be-used-in-more-than-one-application/929/2 "2021-08-04T18:19:09Z")

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Hi there,

A license key can only be used in a single application/domain.

You are allowed to use PDF.js Express locally (localhost) without a license key for development, the output will just be watermarked.

Thanks,  
Logan

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**Author:** ![kampangala2014](https://avatars.discourse-cdn.com/v4/letter/k/919ad9/32.png) [@kampangala2014](https://pdfjs.community/u/kampangala2014)\
**Post date:** [February 26, 2023, 9:37am UTC](https://pdfjs.community/t/can-a-license-key-be-used-in-more-than-one-application/929/3 "2023-02-26T09:37:10Z")

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Hi @Logan I just signed up and downloaded the PDF.js Express Viewer and loaded used in my first test application on localhost I get the watermark. For localhost, if I remove the license key, It throws an error. Is there something I’m not doing correctly?