> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/support/faq/eval-error.md).

# I get a system configuration error

Examples of this error are `Process does not have permission to Read the Windows Registry`.

Using PDFNet in demo/trial mode on development machines is usually not a problem because they are typically configured to have a loose security policy.

However, in case you are using the evaluation version on a production IIS server, you need to grant full permissions to the assembly - or loosen your global security policy.

{% hint style="info" %}
Please note that once you purchase a license this requirement no longer applies. Licensed Apryse products do not require elevated permissions.
{% endhint %}

Some of our customers were able to use the demo on servers with tight security by modifying a config xml file that controls security settings or using \`Code Access Security Policy\` tool. For more info please see:

* <http://msdn.microsoft.com/en-us/library/ff648243.aspx>
* <http://msdn.microsoft.com/en-us/library/cb6t8dtz(VS.80).aspx>
* <http://msdn.microsoft.com/en-us/library/a0ke3k86.aspx>

Because there are many different machine configurations and because the demo is not intended to be run in the production environment, we are not actively supporting this use case scenario.


---

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