# Use lib free version restrictions

**URL:** <https://pdfjs.community/t/use-lib-free-version-restrictions/2513>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [April 7, 2023, 3:35pm UTC](https://pdfjs.community/t/use-lib-free-version-restrictions/2513 "2023-04-07T15:35:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![user15](https://avatars.discourse-cdn.com/v4/letter/u/d6d6ee/32.png) [@user15](https://pdfjs.community/u/user15)\
**Post date:** [April 7, 2023, 3:35pm UTC](https://pdfjs.community/t/use-lib-free-version-restrictions/2513/1 "2023-04-07T15:35:15Z")

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Hi. Can I use your lib for free on my prod site just for read-only mode pdf previewing? Will there be some your lib internal watermark or something else?

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**Author:** ![kkim](https://avatars.discourse-cdn.com/v4/letter/k/3ab097/32.png) [@kkim](https://pdfjs.community/u/kkim)\
**Post date:** [April 10, 2023, 2:22pm UTC](https://pdfjs.community/t/use-lib-free-version-restrictions/2513/2 "2023-04-10T14:22:14Z")

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Hi there,

Thanks for contacting pdf.js express forums,

You can find the differences between the viewer and pro versions here:

> **[PDF.js License Pricing for Commercial Viewer | PDF.js Express](https://pdfjs.express/pricing)**

If you are just using the viewer package, make sure to get your license added but note that the watermark will still show up in development mode.

Best regards,  
Kevin Kim

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**Author:** ![user15](https://avatars.discourse-cdn.com/v4/letter/u/d6d6ee/32.png) [@user15](https://pdfjs.community/u/user15)\
**Post date:** [April 11, 2023, 8:22am UTC](https://pdfjs.community/t/use-lib-free-version-restrictions/2513/3 "2023-04-11T08:22:08Z")

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I’ve gotten your free licence key. And now i have “pdfjs express” watermark. Can I remove this watermark?  
Now we are still using a paid package on this domain. In the future, we plan to use the free package. Perhaps the presence of two packages of the same domain caused the watermark to appear?

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**Author:** ![kkim](https://avatars.discourse-cdn.com/v4/letter/k/3ab097/32.png) [@kkim](https://pdfjs.community/u/kkim)\
**Post date:** [April 11, 2023, 3:57pm UTC](https://pdfjs.community/t/use-lib-free-version-restrictions/2513/4 "2023-04-11T15:57:56Z")

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Hi there,

The pdfjs express watermark will continue to show even with a license for development environment (i.e. localhost)

You definitely do not want to have two packages (Pro & Viewer) running at the same time as this will cause issues: [Watermark still showing even with correct domain](https://pdfjs.community/t/watermark-still-showing-even-with-correct-domain/1596)

Once you make the change, please try clearing the browser & server cache as listed in this post here: [Pdfjs.express watermark despite licence key & correct domain](https://pdfjs.community/t/pdfjs-express-watermark-despite-licence-key-correct-domain/1592)

Best regards,  
Kevin Kim